Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8f76a34b59a642…

MALICIOUS

PDF

74.5 KB Created: 2021-01-17 20:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6d8c35258ad1814c1e3c97eb37f242a8 SHA-1: 6d4ea834d376cf4c8a1da6ffef5b119e373915d6 SHA-256: 8c8f76a34b59a642148b3271f76f0657215f786700b90116c3746378ed985265
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to known malicious redirector infrastructure. Heuristics indicate a link farm and a phishing/trojan detection by ML and ClamAV. The document body is heavily obfuscated and unreadable, but the presence of malicious links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=tekken+steve+fox+combo In PDF document text
    • https://site-1250011.mozfiles.com/files/1250011/business_email_format_example.pdfIn PDF document text
    • https://zebatezovas.weebly.com/uploads/1/3/4/6/134618099/4eddcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417314/normal_5fb2c938936ba.pdfIn PDF document text
    • https://site-1177462.mozfiles.com/files/1177462/present_and_future_value_tables.pdfIn PDF document text
    • https://lamegebepezaris.weebly.com/uploads/1/3/1/4/131438642/5672219.pdfIn PDF document text
    • https://juzoliposiwe.weebly.com/uploads/1/3/4/3/134322138/zurigareju.pdfIn PDF document text
    • https://site-1174278.mozfiles.com/files/1174278/zirexesikaruxonidipetopov.pdfIn PDF document text
    • https://site-1172119.mozfiles.com/files/1172119/sojog.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/5292646.pdfIn PDF document text
    • https://vapipokolodux.weebly.com/uploads/1/3/4/3/134307816/labekumimofe_pusazosabi_bebuto_sarexuminepivad.pdfIn PDF document text
    • https://gexeperi.weebly.com/uploads/1/3/4/3/134348656/2b352891.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sikuva/tefuzozininixijur.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/gotipelunodenijiruzew.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/sivoluzinuxemug.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/xamel.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/production_technology_of_medicinal_and_aromatic_plants.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 4972 bytes
SHA-256: 8ff401c0a8472398c903db89cbe31247604f2b001de55c47f92f18d028929c81
font_01_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 12296 bytes
SHA-256: bdc379e24083e1bb0498ee42a3e43e707ad0a88abc337a65d2d9ea9f066c01f4