Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c84d6042b13c42a…

MALICIOUS

PDF

82.4 KB Created: 2021-05-19 19:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 335f70c588b465a657f6dd330973e77d SHA-1: cfbc54c1dfa1346dda9d8878a8f9c34b22cb2f90 SHA-256: 7c84d6042b13c42a3d14e5e4491c6fc10c72532c0e07acaf70dfae61ab5ce972
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 0.9990

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=best+screen+recording+app+for+android+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401976/normal_60519afdbbfc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_60564de4d7b82.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/4131645.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412900/normal_5ff683482920c.pdfIn PDF document text
    • https://nugobobunebiset.weebly.com/uploads/1/3/5/3/135303429/kigelukumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_60434df25df2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_604907dc39063.pdfIn PDF document text
    • https://rixatesar.weebly.com/uploads/1/3/1/8/131871899/4e61c406f3.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/javepisovemo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fe067755aab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446400/normal_606e9abad33fe.pdfIn PDF document text
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/tiromuwumega.pdfIn PDF document text
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/4bdbf006.pdfIn PDF document text
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/rubawiwebasaridunedi.pdfIn PDF document text
    • https://sijapuxojowul.weebly.com/uploads/1/3/4/6/134616399/paxazejuboboximore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_5fe90b579bc62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501385/normal_60012c4b7c34f.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/tatazodimademituki.pdfIn PDF document text
    • https://kuduxefu.weebly.com/uploads/1/3/2/6/132695679/sonafikekigabe.pdfIn PDF document text
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/pozig.pdfIn PDF document text
    • https://zonuloxovuge.weebly.com/uploads/1/3/4/4/134469127/zuduwevevig_negisesula.pdfIn PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/5737278.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
    • https://s3.amazonaws.com/mevuzokekenojab/69937280332.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/love_story_theme_lyrics_andy_williams.pdfIn 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_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 5128 bytes
SHA-256: d3723921b5bab124b876ca046ebe530234911a5708c9eb5f6fed7c3ecae594f9
font_01_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 10720 bytes
SHA-256: 6b4088198264f83d332bc9546a00fc64af32952290c0ba0754ce6a9c59ba0d92
font_02_sfnt_off00012d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D80 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34