Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4d3b2f0ed99051…

MALICIOUS

PDF

77.9 KB Created: 2020-12-14 20:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4010a45defdef968d9ba0f7c973ab643 SHA-1: c85acdbb52a898e6f2e8afc94b97d7f41bf99516 SHA-256: 8d4d3b2f0ed99051accc4f7c68f3b292af2ee34aff6c6baa5b7907e8a6afdf8f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farms to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful 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 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.
  • 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/123?utm_term=the+blazing+world+sparknotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456128/normal_5fa7342ad890d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f875f03244f2.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/xexudagozoje.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/dibageginonivej_wogebip_baximenaxogemuj_sebavojupo.pdfIn PDF document text
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/siwejutifub.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/selivuvumepaveb/68957041242.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/riniromojikowowa.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/teas_test_practice_questions_english.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/50645112193.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/72070591122.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/critical_ops_apk_mod_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/barron_gre_vocabulary_list.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/zopov.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/xibuxekitewatowo.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_off0000e6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 5304 bytes
SHA-256: 1fca34fa575507f0941979b648bc2ebd7bc9418f6a46a3a560fd910a375ff29e
font_01_sfnt_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 10812 bytes
SHA-256: 43e36c05a1c1939cfe8e35385c8fd53a4c8668e71ba9caec0b764b49c0208266
font_02_sfnt_off00011c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C73 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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