Malicious PDF — malware analysis report

Static analysis result for SHA-256 87735b77cf66af5f…

MALICIOUS

PDF

81.0 KB Created: 2021-04-14 01:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5310cfae8661234fda343a67b5147203 SHA-1: 94e0d1e2dff1f7378e92280b3796414f429136b2 SHA-256: 87735b77cf66af5f82808c057547214b42bd2c83be47da6a6de2c4c7209ed0c3
156 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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=the+edge+of+never+book+online+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384037/normal_5fe962be85486.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/asu_mechanical_engineering_major_map_2020.pdfIn PDF document text
    • https://jabikazisejifo.weebly.com/uploads/1/3/1/6/131606509/sasapegubazinan-gugudofaga-nejexewavuwuvun-perezulifugokid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486748/normal_5febb583ad9b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465548/normal_5fd04cf245258.pdfIn PDF document text
    • https://zuberexuwaxif.weebly.com/uploads/1/3/4/5/134501439/3062286.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/f289b87a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455642/normal_5fcaa6060fc17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_602116277c4f7.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/a6e99536-1f21-4ab6-8762-0c1db3df6bf4/basic_concepts_of_oops_in_java_with_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8407a0-9381-4a33-90ae-49a768bb3b70/kigavepapunosenawino.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/bupitiruvalodu.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/endometritis_antibiotic_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/how_to_find_outstanding_checks_in_quickbooks.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/how_to_use_gazelle_glider.pdfIn PDF document text
    • http://gefilodeza.myartsonline.com/puritan_bennett_840_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/51182518799.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_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 4992 bytes
SHA-256: ad7397a1679dfc30135d1d1c386b0e1527a490131ad35be84ec348501bbc3f5d
font_01_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 10764 bytes
SHA-256: d25abbdb20a04993a04aa8101c62d2bb7847bb10a0520997c057c5a6086e1ed7

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