Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ec2437ce4df3e5…

MALICIOUS

PDF

78.2 KB Created: 2021-03-06 02:12:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cb775ef7642b780e29dc034cd8de0e0b SHA-1: 5d0a9c1c623ceeea5d86f9da471e079df936ca17 SHA-256: 11ec2437ce4df3e520378fe2ace2c0e540cefda0c869e18950300969fb663bb0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 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://pelibifir.ru/123?utm_term=how+to+remove+mountain+bike+headset+bearings PDF link annotation
    • https://jewupoma.weebly.com/uploads/1/3/1/4/131437657/xidupuzopumoxositul.pdfIn PDF document text
    • https://nabaladeso.weebly.com/uploads/1/3/1/4/131438379/7689331.pdfIn PDF document text
    • https://ribafiligizeki.weebly.com/uploads/1/3/1/4/131438260/688fcfea569a0d.pdfIn PDF document text
    • https://wemivera.weebly.com/uploads/1/3/4/3/134311686/7d7d40b45160ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418972/normal_5fd64b5400afd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_602d0bac7150f.pdfIn PDF document text
    • https://jiwebatije.weebly.com/uploads/1/3/3/9/133997557/rinokafeferi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_602bab8604626.pdfIn PDF document text
    • https://ruritavi.weebly.com/uploads/1/3/3/9/133988031/69311e2.pdfIn PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/parobogadukafuz.pdfIn PDF document text
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/8353667.pdfIn PDF document text
    • https://toxafowusolele.weebly.com/uploads/1/3/2/8/132815148/1cb4e1d9e9b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382793/normal_5ff28fe49b292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426271/normal_6008a93657125.pdfIn PDF document text
    • https://mevukufidax.weebly.com/uploads/1/3/1/3/131379039/fevagomiv.pdfIn PDF document text
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/valodi.pdfIn PDF document text
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/6ab8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_5fd7d013c7fb1.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/wavunot/android_emulator_has_no_internet.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/the_elves_and_the_shoemaker_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/allo_allo_episodes_guide.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_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 5524 bytes
SHA-256: a360d457aaceebe5d71c41739c18a070de9d422eebb055111fc55253f34a6805
font_01_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 10440 bytes
SHA-256: fc6dc6f407e6bc019deb8fc80d898cd319327022b871cdd09c4d3a5a5df8c08f

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