Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf41099d9e83c56…

MALICIOUS

PDF

81.2 KB Created: 2021-03-17 21:05:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d1f1ea14f1d0cc3ef9cea49aa7baad07 SHA-1: 5feee4cdce11236d159824301e7d62d6f30b6474 SHA-256: 6cf41099d9e83c5687dc474941adfc9f17d752f8d9f71d4a5f1132a052a565af
244 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous embedded URLs pointing to external PDF files hosted on disposable domains. The presence of a link to a known malicious redirector and the high ML classifier score indicate malicious intent. While no scripts were extracted, the document's structure and embedded links strongly suggest it is designed to lead users to malicious content or facilitate further infection, likely through a phishing or SEO poisoning tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+replace+ge+electric+stove+top In PDF document text
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/4067681.pdfIn PDF document text
    • http://gnatural.space/windows_10_lock_screen_location_infoka23q.pdfIn PDF document text
    • http://catsism.com/35148423172bqk7k.pdfIn PDF document text
    • http://kpovli.ru/vudagefejanevemuxadiws4akc.pdfIn PDF document text
    • http://zugobopepoj.sportsontheweb.net/catalogo_aspiratori_vortice_2020.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/3192334.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/b1882362ee85a9.pdfIn PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/juzajawutatedeko.pdfIn PDF document text
    • https://xemudimiju.weebly.com/uploads/1/3/4/8/134861016/sofoxowubewunemufape.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/ankylosing_spondylitis_symptoms.pdfIn PDF document text
    • http://byseles.xyz/john_the_ripper_commands_windows582yn.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/84981532616or5ri.pdfIn PDF document text
    • http://zitarekatinupas.sportsontheweb.net/filarial_nematodes.pdfIn PDF document text
    • https://nijuvijoz.weebly.com/uploads/1/3/1/4/131408832/1366704.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://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_b2cfd96408a4440f9460c5c0a7625ec2.pdf?index=trueIn PDF document text
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_562a5109b6624ec3b1df21e71473dee2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/129449e6-dbcb-4978-a0e9-c951531c7ea2/xofekajuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63559637-de9b-4605-a99c-355bba665c42/66317742144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5bc0a0-9bf8-4891-be3c-07b0cb08b24c/72404232097.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_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 4896 bytes
SHA-256: a764ae2e3f30f5fabafa104c7a1bb2bc980e20976821533177325c4a290ef0b7
font_01_sfnt_off00010514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 10716 bytes
SHA-256: 56812296e786f2e7954604523500bb0a7408bd1f40c58bfce2ee55ff8f98cefe
font_02_sfnt_off0001297e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361