Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a997c428b7d87bb…

MALICIOUS

PDF

93.0 KB Created: 2020-11-12 21:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 82fa98de678264d0be65cb38460806f2 SHA-1: bf494b5f137dd727a5de8aa89da88218193f986c SHA-256: 7a997c428b7d87bbfbd3b9ee30b8d6ab1a15ba022668562a3c0d24a9932e4619
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or phishing attempt. The heuristic firings confirm the presence of malicious redirector links and a general ML classification of malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=arden+grange+partners+feeding+guide In PDF document text
    • https://diboboxu.weebly.com/uploads/1/3/4/3/134330346/xigonujima_xefewotisu.pdfIn PDF document text
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/6085373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_5fa7ed8612c5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409797/normal_5fa3a247b0cbe.pdfIn PDF document text
    • https://gerapulopenun.weebly.com/uploads/1/3/4/5/134587141/kekovileka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f991df718943.pdfIn PDF document text
    • https://wowifowukanu.weebly.com/uploads/1/3/4/6/134634936/wetovolul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5f0f10-f75c-4c75-a22b-a28340856a1b/diabete_gestationnel_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab41ec6-81ba-426e-9afd-f12b6c4d5313/92614158589.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/sobasigumopip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b873b0fc-5358-4a27-bc11-02af7245e09e/sid_mcginnis_making_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5103297-6f91-4c20-bbeb-008b44ad7db8/best_android_obd2_app_reddit.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001366c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1366C 26916 bytes
SHA-256: 9bf3ebf47819f76e3039d870efbbad7f21c6555d295b66a5451ed2f2ced5bea2
font_00_sfnt_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 5164 bytes
SHA-256: e8bab7131cca46399230bf5b72ce5bc32d4951c950a70fcf4dc725a168c91267
font_01_sfnt_off000110aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 11132 bytes
SHA-256: fd32ae88d573da9b13362a1180cf75d0622639219bd8ff09f5fe7c7386b64243

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