Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf81290cc144d3c8…

MALICIOUS

PDF

72.8 KB Created: 2021-03-02 19:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 18ef2bd7f69c783db725e81d4167163d SHA-1: 76ef149481c0b865adf7674363e2d5df1105ee0f SHA-256: cf81290cc144d3c83a32010af58dc31819f753632d9477eb1153272e281a08c5
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm on disposable hosting, pointing to a phishing or malware distribution scheme. The embedded URL `https://jumiwimov.ru/strik?utm_term=weber+spirit+e-310+home+depot` is a primary indicator of compromise, likely leading to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://jumiwimov.ru/strik?utm_term=weber+spirit+e-310+home+depot PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370280/normal_603975636d321.pdfIn PDF document text
    • http://reduslimitalia-official.site/277843435527u3dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419211/normal_602c930ca7f4d.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/ffqzgdr/best_horror_movies_on_netflix_hulu_amazon.pdfIn PDF document text
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/xuderiwokute-puvewog.pdfIn PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/pawiduzo.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/aifjd8T/defender_110_review_2015.pdfIn PDF document text
    • http://cashbackk.site/89448793632rn1q7.pdfIn PDF document text
    • http://getyourcredit.info/anhalteweg_berechnen_nach_der_faustformelf9g23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497356/normal_5fcf252020163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_6032dddbd10d0.pdfIn PDF document text
    • https://cdn.sqhk.co/vumulevezuf/ajeQszT/megapokovimapenasenijoka.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/xedewofuretujo/zamapepozitum.pdfIn PDF document text
    • http://kowotasube.epizy.com/apt_decoder_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/what_kind_of_business_can_i_start_with_100k.pdfIn PDF document text
    • http://nepuruwepan.epizy.com/jutezavefanesebugijoz.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/zonanupijutejowum.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_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 5500 bytes
SHA-256: 9e2a0e9b63846d0b97e6afd0df6f07d206c66577bdb47504af1d5b55e8a64d96
font_01_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 11160 bytes
SHA-256: 9d57c13d4d113bafc3e2e19b0b38657a37bd8f5f5e6600edd86bd71ff8485473

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