Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc22c0d47e5f87e…

MALICIOUS

PDF

78.9 KB Created: 2021-04-03 19:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5e3a1891625c7983b212205c64f741f1 SHA-1: c9bea54314c1d90d5a0cc3b5c083d77cffa6fe81 SHA-256: 4bc22c0d47e5f87e3a1e8e3ed2600e32c93f657825c753289c6d4edfd4b04ead
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=minecraft+tower+defense+2+hacked+online+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485152/normal_5fe6dd324307b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502906/normal_6030dd4378a40.pdfIn PDF document text
    • http://biomanua.website/formal_wear_hire_mandurahz9066.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/zewezinar_mepaxutugilet.pdfIn PDF document text
    • http://buvinivu.iblogger.org/how_to_reset_quadra_fire_pellet_stove.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/2214628.pdfIn PDF document text
    • http://nivavonuzav.22web.org/wukixujipo.pdfIn PDF document text
    • http://mebelintera.ru/male_and_female_reproductive_organs_and_their_functionsl6olg.pdfIn PDF document text
    • http://tohld.in/what_is_the_storyline_behind_the_nutcracker_balletrvz5m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bilodevufutumu.rf.gd/indeks_pembangunan_manusia_indonesia.pdfIn PDF document text
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_f77c8492e1fc49018ed591448b7dff76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe46fb2-1df7-4829-8c08-2a98a056bee4/how_to_teach_spoken_english_for_beginners.pdfIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_96df35a667204d6db63bcac4101ba0f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8105bfb5-74d9-4337-af3a-228c201b9f8b/what_is_a_common-knowledge_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b657aba-af74-4bc2-b7af-b45e2c7cdcd6/luwexigazawukegaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1510d2f9-7bcc-4421-a720-a465703c8977/fedex_customer_service_number_get_human.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86acbbb7-f42e-4701-8716-43bf309ac214/xakalosenunowo.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_22f78ff0448a428ab388d9d4fc04d6f3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 5516 bytes
SHA-256: 4821f4831dd0684b3edd8d0deb5694ffefa54c568fb91f6651d4312234e48ed9
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 10804 bytes
SHA-256: 18d01f6c41f87482e95394e2bbe01fd6bf872616bd4bb319e89084206a91d9b2
font_02_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3