Malicious PDF — malware analysis report

Static analysis result for SHA-256 2add8126719a7c3a…

MALICIOUS

PDF

80.6 KB Created: 2021-05-29 07:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 752962d91939dfc0244d0d9c2f277523 SHA-1: d7a67fa4366f132cc9ebc1c1484f489f39c3bd32 SHA-256: 2add8126719a7c3aa106e1de1cf3141b0716aea61b0d89d1368c538e0ab81ddc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The primary URL, https://ponafet.ru/123, suggests a phishing or malware distribution attempt disguised as a worksheet. No scripts were extracted, but the PDF structure and link farm indicate a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=demonstrative+pronouns+worksheet+3rd+grade
    • https://cdn-cms.f-static.net/uploads/4456989/normal_604ceb500e7ad.pdf
    • https://xediziku.weebly.com/uploads/1/3/1/3/131384396/kapinuk-wisogepovanu-kowiboxizar-tugakow.pdf
    • https://static.s123-cdn-static.com/uploads/4409255/normal_5fc576b691694.pdf
    • https://cdn-cms.f-static.net/uploads/4387825/normal_5fe805dc50220.pdf
    • https://zojivevu.weebly.com/uploads/1/3/6/0/136090852/5245982.pdf
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/zefumimopiwisa.pdf
    • https://static.s123-cdn-static.com/uploads/4409396/normal_5fe26794881c7.pdf
    • https://dodesagetulisuv.weebly.com/uploads/1/3/4/9/134902864/jawikerowodolugax.pdf
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/2576805.pdf
    • https://xanowiporak.weebly.com/uploads/1/3/0/8/130814060/figizot.pdf
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/sezobagawoje.pdf
    • https://static.s123-cdn-static-d.com/uploads/4402250/normal_60b0749aa1062.pdf
    • https://cdn-cms.f-static.net/uploads/4495413/normal_6042e9e67738a.pdf
    • https://cdn-cms.f-static.net/uploads/4445103/normal_603b6246b545d.pdf
    • https://static.s123-cdn-static.com/uploads/4467287/normal_600901997fd39.pdf
    • https://cdn-cms.f-static.net/uploads/4418583/normal_604169474b41b.pdf
    • https://tabodixab.weebly.com/uploads/1/3/4/5/134585887/a6a2e88967e1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/de880cb0-c40e-4890-9d6f-9fd1ff1dfdf7/31647765285.pdf
    • https://uploads.strikinglycdn.com/files/57334f9e-402d-4761-85d1-89722c90ec01/nitecore_i4000r_tactical_flashlight_review.pdf
    • https://uploads.strikinglycdn.com/files/b4243ce4-c972-4821-b4f2-6e4d072f0799/17309678678.pdf
    • https://uploads.strikinglycdn.com/files/e96339ce-86a6-4600-b5c1-71075252bc48/how_to_reset_ozeri_bathroom_scale.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd9.bin
c35c81133618680f3541086df0972b9867de3295111f2f6fad13c492a56605ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 5600 bytes
font_01_sfnt_off0000fed0.bin
cf1062672fd2ee7ea1bb3cd90fcaa3df2d1b015a27ebf8180430dd586bb778a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 11064 bytes
font_02_sfnt_off00012491.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12491 4324 bytes