Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c48a2212163016…

MALICIOUS

PDF

90.2 KB Created: 2021-04-08 09:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 86d5480d7c135cf8e8b7908e7b334ff6 SHA-1: b3558edafc9b0e4c3b2754406de65c72d8e8139a SHA-256: f9c48a22121630169ec6a60740a37f5b9548b3aa799f3fa0661bbbb892232c03
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded URLs, such as https://midufefew.ru/strik?utm_term=kitchenaid+superba+double+oven+model+number, are designed to appear as search results, further supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/strik?utm_term=kitchenaid+superba+double+oven+model+number PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5fd0922680dab.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/in_what_order_should_i_watch_sword_art_online.pdfIn PDF document text
    • http://penageli.getenjoyment.net/breakthrough_prayer_guillermo_maldonado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_60583c6194db8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376600/normal_6008fcfbae289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489717/normal_5fda32d3be4f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5fd109d6bfdb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480756/normal_6047266c7dd0f.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/jedibofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_600fd27431846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_606446e667ad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501804/normal_601794d976738.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/969d8dbb-3b59-4f0a-8516-cb0308cf675c/sharp_spc524_projection_alarm_clock_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e6a14b2-dd2c-4759-a584-19450dcd06c4/honda_hrc216_hxa_parts.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_0ffb1b17b49641059a729a4180007fdb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab43073-fee1-48e9-a64e-969230ce1874/xutolejatuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d35b2b5c-0f65-4ef1-9517-b807ccd84df6/what_is_the_biggest_living_creature_on_earth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b6b8ab-620b-41de-89ac-cdde712970f9/83631369093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/922128e0-51e4-4322-9e6d-354ea606d58a/how_to_teach_online_english_as_a_second_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/196c91ab-ab7e-4a45-9bd6-32b05d7c1b60/the_fall_of_five_pittacus_lore.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_59c076aa1e264840a5c08b9c503e3775.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f4e534f-b4b8-45b9-9682-35751c61f982/acer_laptop_buy_india.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_ff4f6961e0174fa0b96a0757a9939ba5.pdf?index=trueIn PDF document text
    • https://b147a2f3-58af-4013-9def-597e86e94513.filesusr.com/ugd/47d6bb_f77c53945135494e8cc842b94148aa25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b75ac01-e6a1-410b-9acd-4dba81b304d9/womolagukejogowowoloruv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf5437e-db18-4f1b-bddb-078abea06adb/how_to_connect_symbol_barcode_scanner_to_computer.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_aef38a6619df44f8b2ccb1805d6eb5a2.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F42 5480 bytes
SHA-256: 7c9c1252be0fb70f7b4b46af2cce99cc86565340f9afb3143b19508440b6da79
font_01_sfnt_off000131c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C0 11652 bytes
SHA-256: a328c30f856a3e29292bb1d002027b66d31db17bd07330c7b8be63863a90620f