Malicious PDF — malware analysis report

Static analysis result for SHA-256 798bfa2ab81c3f44…

MALICIOUS

PDF

69.9 KB Created: 2021-03-26 19:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6dfa6abb39bcd82a37c117bae3cf3a2a SHA-1: 24f4cd03b1b2706d44006a5eb8bef8e29040134c SHA-256: 798bfa2ab81c3f44a4a954d424903688977ecf3be406d83b309688773852fdfe
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, employing a link farm on disposable hosting to direct users to potentially malicious content. The heuristic firings indicate a significant number of external links, many on disposable domains, suggesting an attempt to distribute malware or redirect users to phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://fokemale.ru/strik?utm_term=ford+4000+tractor+manual+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468871/normal_601cc9e3f3ce9.pdfIn PDF document text
    • https://potemoguzoka.weebly.com/uploads/1/3/4/6/134646314/kotibixuwojubirimu.pdfIn PDF document text
    • https://lobogisotu.weebly.com/uploads/1/3/4/8/134870795/tewilu-walitewi.pdfIn PDF document text
    • https://lamamamim.weebly.com/uploads/1/3/1/6/131606140/fapun.pdfIn PDF document text
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/velesuzu_piworukuven_laloko.pdfIn PDF document text
    • https://dozetiwe.weebly.com/uploads/1/3/1/8/131856451/bijenonenor.pdfIn PDF document text
    • https://lukumupanulafaz.weebly.com/uploads/1/3/4/6/134683212/sedomoseba-subabof-fofuvatipinu-zulizivavenej.pdfIn PDF document text
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/bixolowo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401519/normal_6007a01fb269e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482849/normal_5fda0336d8000.pdfIn PDF document text
    • https://kamapapidez.weebly.com/uploads/1/3/5/9/135962567/bewab.pdfIn PDF document text
    • https://zixokamewi.weebly.com/uploads/1/3/4/3/134386319/ruzujixe_rotanitimunas.pdfIn PDF document text
    • https://visemuturivawo.weebly.com/uploads/1/3/4/6/134673250/6032313.pdfIn PDF document text
    • https://vokijovagugudis.weebly.com/uploads/1/3/0/7/130776016/2735611.pdfIn PDF document text
    • https://biwozatilajatem.weebly.com/uploads/1/3/4/6/134636438/rebow.pdfIn PDF document text
    • https://wojemalivameju.weebly.com/uploads/1/3/0/7/130775107/nitisoxinubofeji.pdfIn PDF document text
    • https://lidutefavova.weebly.com/uploads/1/3/4/0/134012516/bibekinivusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gudelapomopovu.rf.gd/7866382990.pdfIn PDF document text
    • http://botixegaminolol.rf.gd/jikupe.pdfIn PDF document text
    • http://rejefuwozumij.rf.gd/javascript_date_format_add_minutes.pdfIn PDF document text
    • http://xagunege.epizy.com/rac_breakdown_cover_uk_policy_booklet.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_off0000d33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33D 5268 bytes
SHA-256: 90a08e83e22fbc3dcb0d1beefaf5aa0f6541515df4b0570c0f895de058931e87
font_01_sfnt_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 10788 bytes
SHA-256: a4e451d9171642f5869421bd448009c1216b12ba87d6747cb536c57b16498305