Malicious PDF — malware analysis report

Static analysis result for SHA-256 16057f281d34d0ff…

MALICIOUS

PDF

78.6 KB Created: 2021-04-17 20:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9eba702a7840edbfd2bae913a821324a SHA-1: ba23b00c64e8904ca118101814dbfc620388ae58 SHA-256: 16057f281d34d0ffcdd8e6dec128298dd8b5eefe960d6dd65ef46d410e1f1c53
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://resalured.ru/strik?utm_term=casio+aw-80-1av+opinie', suggests a phishing or scam attempt disguised as product reviews. While no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful websites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=casio+aw-80-1av+opinie
    • https://pixiguva.weebly.com/uploads/1/3/2/6/132681827/dupewodareneb.pdf
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/vinelo_patofenimabi_vofide_xigesasaxitegu.pdf
    • http://salestore.pro/java_software_solutions_8th_editionhvrns.pdf
    • https://cdn.sqhk.co/xuvomuvugu/pgcici9/41148_4_apk.pdf
    • http://babysampler.com/how_to_prepare_for_amazon_interview_redditahp8g.pdf
    • http://xibesofene.22web.org/biderebapadixe.pdf
    • https://kopujigok.weebly.com/uploads/1/3/4/8/134862339/zuporetu.pdf
    • https://cdn.sqhk.co/suzagofi/ihVPP9V/5904492454.pdf
    • https://mijevofere.weebly.com/uploads/1/3/1/6/131606011/5141397.pdf
    • https://tejifogigevavep.weebly.com/uploads/1/3/4/6/134675995/2e16fad954.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2182862e-afa8-45a9-a9c4-d10345fb6bf5/what_does_seeing_orions_belt_mean.pdf
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_626c8d6e8b2e4696bffa5f61a4cab79a.pdf?index=true
    • http://zodupubulorak.epizy.com/43779185247.pdf
    • https://uploads.strikinglycdn.com/files/8fb13e9d-461a-4f05-ace0-bb72fb64d8fd/common_and_proper_nouns_worksheet_3rd_grade_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/455a7535-6771-402e-9869-eac60928694a/singing_cowboy_stars_book.pdf
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_1a0ad468d1f94402bec2e44cd86c2fe5.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a8.bin
eca3ac7bb6e3c4e1f4407562cc43e004889a90b4c5c96696e9e5a70c5e298d2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 5164 bytes
font_01_sfnt_off00010367.bin
132afb70906f98601a5b52bf85f4dc38e9301822d33d960ca30f76314c53a122		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 12768 bytes

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