Malicious PDF — malware analysis report

Static analysis result for SHA-256 a184cc45cf672c46…

MALICIOUS

PDF

77.4 KB Created: 2021-03-09 21:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ce3c670b638f88c57cbc515a2d502b91 SHA-1: 53b69aa4763e76f80acaeaafac4e33cad3dd32b6 SHA-256: a184cc45cf672c4648bfbd8980f102d6ae7cf46b92d6bffbf13c52d068226550
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/award?keyword=2020+champions+tour+schedule+pdf PDF link annotation
    • http://visobewitumimek.22web.org/71450684505.pdfIn PDF document text
    • https://ruwefenoref.weebly.com/uploads/1/3/0/7/130739117/zewad_gakojarifemegib_xutajemapun_pivusutufepo.pdfIn PDF document text
    • https://topagolidokade.weebly.com/uploads/1/3/4/5/134502990/fuxufanu.pdfIn PDF document text
    • https://namekabesomi.weebly.com/uploads/1/3/4/6/134668803/zusukidozurowa.pdfIn PDF document text
    • https://fotavimapuwe.weebly.com/uploads/1/3/2/8/132816041/fizavu.pdfIn PDF document text
    • https://kizevopizimi.weebly.com/uploads/1/3/5/3/135351298/82a209.pdfIn PDF document text
    • https://gemuxobupi.weebly.com/uploads/1/3/2/6/132682013/0792f387bfb8fc.pdfIn PDF document text
    • https://regapopuro.weebly.com/uploads/1/3/5/9/135964604/golag.pdfIn PDF document text
    • https://lubavezutumeji.weebly.com/uploads/1/3/4/7/134757539/seruzurutedapufod.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/b3114a32-7908-48a8-8512-fb2333d8b1dd/how_to_replace_seiko_solar_watch_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0359687-a125-4b92-8477-9dbe6edc6b64/the_river_church_tampa_staff.pdfIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_29eae605554b466e87109b1a74b1cc58.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/624b1666-e005-4b64-ac60-69ca2d25513d/42277122676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ad4d18-df50-4898-b3ee-6858b58b976f/will_evening_primrose_start_contractions.pdfIn PDF document text
    • http://poxemibusap.epizy.com/xabamuzozuraja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a476dc12-8b22-4b2b-bf6e-601d959e4126/irulu_walknbook_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ee5f51-1e93-4d96-a523-2d4ce7c58cd0/12497591321.pdfIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_53332fa0d0cf45e6ae4c24cbc6495e26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d1187f-1949-4b31-adc6-6c95848583d0/lopakizofufabinegusaliwe.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_c884233ab97443cb801b31ba1123ebe5.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_9827ea7cf5484177812d2edb1c9affb2.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_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 5572 bytes
SHA-256: 656042c7d2ad8a30f84035cebe365d052f3f43efe6460e9f18dfdafd5a84b85b
font_01_sfnt_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 10160 bytes
SHA-256: 789baa6212719abcc41560a752598d7a789dfaa804b7604070c9655d2ba986a7