Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c4870e22eb2c91…

MALICIOUS

PDF

73.5 KB Created: 2021-03-19 00:57:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f6fe580ccd653f232eaacaa388d1a03d SHA-1: e2bd2490a06a7b26c882d8c1f18f1442b973171c SHA-256: a7c4870e22eb2c918a1ac39d977fe2e61043899ab961c2648e894406a57f5331
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including those on disposable hosting and link farms, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF generation and potentially misleading text, further supporting the attack pattern.

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 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://nipisod.ru/123?utm_term=female+reproductive+system+questions+and+answers+pdf PDF link annotation
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/1b9b29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491439/normal_6044fd223fd22.pdfIn PDF document text
    • https://juvezunadu.weebly.com/uploads/1/3/5/3/135306862/rakomedilakow_rezuwanabuzat.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/airspace_sectional_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_6051f4b6d47f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486983/normal_5fff51aa3c975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_60206f0b99323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490523/normal_60219c3ad84f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419626/normal_5fc7d14778acd.pdfIn PDF document text
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/9366663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_60132441493b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gamelaluwer.myartsonline.com/actual_ring_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36dedc07-3792-4480-b77a-3116872a8752/marlin_336_rifle_sling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/049f7f91-8760-418c-9c74-bf5e73b8788b/how_to_use_verizon_extender.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/22114315313.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/93058024479.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/harlan_ellison_terminator_outer_limits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2aa8d4-5e4a-4a60-a5e8-065387bcf1f7/how_do_i_find_the_phone_number_for_my_verizon_jetpack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e39f6a3-52d3-47fd-b144-e4c32826984b/ernest_hemingway_best_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/956e22e4-db4f-4a3e-81f6-37f305b397e3/56658732946.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/upkar_movie_free.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_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 5636 bytes
SHA-256: 749d1bd4b5ebd4ca31c00eb3fe351f5300e73494e4d0c00152d3dc433805fbb9
font_01_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 10464 bytes
SHA-256: 299fd741c73e2b022260ebad363ee24d5a937e2a4d0a86b6eb86833925dba740

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