Malicious PDF — malware analysis report

Static analysis result for SHA-256 803bf7ff57846805…

MALICIOUS

PDF

71.3 KB Created: 2021-01-14 23:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 45997171859f17dc7aaffe792385cb07 SHA-1: 518c7451be376296a43e556af7bec080c8501cbb SHA-256: 803bf7ff578468052bc7fdb208b0d5732228df22a765f1f46de7cfb993b200b3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with a high-confidence heuristic identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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://traffnew.ru/aws?utm_term=all+songs++mp4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410414/normal_5f9ad2441f905.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5feb33e547fce.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/nemuvokux.pdfIn PDF document text
    • https://cdn.sqhk.co/mukutosi/mghcjZi/95890641518.pdfIn PDF document text
    • https://tizukusijevawus.weebly.com/uploads/1/3/4/4/134454617/fenurixavurenajaja.pdfIn PDF document text
    • https://vefigemeg.weebly.com/uploads/1/3/4/3/134368147/ece395648946dfc.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxunoromi/OidMagj/simple_small_business_plan_template.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/hrcEhdh/sewapaxigotod.pdfIn PDF document text
    • https://vuriluwaloseg.weebly.com/uploads/1/3/4/4/134492921/7f65d9d85d40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481068/normal_5fb789fd2dc51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5fab960017e6f.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/defujo/90964421327.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/wovojibetomow.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/skewness_and_kurtosis_notes.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_off0000dafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 4912 bytes
SHA-256: a9c6af9b5946cc230e56e268d3c41aa5b9843f3c1086c991059b0a9606750952
font_01_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 10852 bytes
SHA-256: df8b07a24175ed0a791fec9f330edc5e947d0401847ba56f1bdbac729b7e0bc2

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