Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a51cdffe8f8f91…

MALICIOUS

PDF

68.9 KB Created: 2021-01-11 10:39:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 144d33c73b936b921987d0a9394c2054 SHA-1: fbf912f80e3afafc357c25983f6f3c890d81090a SHA-256: 97a51cdffe8f8f91bbd9dcba970a26e79faabb02b62842e25bbb30130e66a9e1
134 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 and presents a deceptive download button. 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=gerund+or+infinitive+choose+the+correct+answer PDF link annotation
    • https://mijevofere.weebly.com/uploads/1/3/1/6/131606011/da6cdcfa2.pdfIn PDF document text
    • https://site-1177940.mozfiles.com/files/1177940/psychology_fun_facts_tumblr.pdfIn PDF document text
    • https://site-1172565.mozfiles.com/files/1172565/49834226885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5f889285bff52.pdfIn PDF document text
    • https://site-1175416.mozfiles.com/files/1175416/word_connect_answers_level.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445564/normal_5fefbd3ecda7d.pdfIn PDF document text
    • https://site-1172650.mozfiles.com/files/1172650/lusamorenazaxawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459624/normal_5fe59e7e137d9.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/divexikav/96189716273.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/ccc_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/63753303939.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_off0000cf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0D 5260 bytes
SHA-256: 344b1e602c060a653575f41d39dec26eb046d8460ca80f578045d0e4168cc9fe
font_01_sfnt_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 11052 bytes
SHA-256: 51eb7e18aa044810a248485feba58f26e3673e4de32fdde67b9f2b8d94f2c80f

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