Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ca35ffaf158ee2…

MALICIOUS

PDF

71.6 KB Created: 2020-11-13 22:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 07457340c982439cc7db58e840a46db0 SHA-1: 2817678602678667f4b59eafbc9fbf5fd463cc9d SHA-256: 77ca35ffaf158ee2c8ae5b59405fa9e8ffff19e61f5735499e86abfbb3628be6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/strik?utm_term=fluidos+newtonianos+y+no+newtonianos PDF link annotation
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/1581069.pdfIn PDF document text
    • https://gakexuguzadeza.weebly.com/uploads/1/3/4/4/134401700/5a454d47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454056/normal_5fad4e60ca3c1.pdfIn PDF document text
    • https://tewifevorifoja.weebly.com/uploads/1/3/4/3/134387655/neruzosi-retexo-kenagomud.pdfIn PDF document text
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/fewuwefuvufu.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/voxexinelosiremejas.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/nomusilibefonag.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://s3.amazonaws.com/zetare/woxipuxapovanamalugerug.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/rapogejilolobiko.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/88028534869.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/mulurulamelajusiwed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e2529a-c5d1-4c7d-ab61-175407e11a6d/jumenikupetelamagedakuv.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/sezifijezevitali.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_off0000cd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3D 4752 bytes
SHA-256: 969874908517815aff01e58850c82d90ac05e23f38febb471a1b85609cee0aa5
font_01_sfnt_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 11672 bytes
SHA-256: e60f4c883a34bba8085a235ca189434d13c9256cc009848cf3d14d719bfa5eab
font_02_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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