Malicious PDF — malware analysis report

Static analysis result for SHA-256 f056fe93e76f1d8d…

MALICIOUS

PDF

78.2 KB Created: 2021-05-24 21:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecd4497dda726b9629c31dcb336a22fe SHA-1: d4077cca4d59b9b23fc11fd4f06c4e95157b50f2 SHA-256: f056fe93e76f1d8db307e0a5d8553384f3d4095551f2f1bb49f9d27dca2924f3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, indicating a link farm strategy for SEO or malicious redirection. The primary URL, https://pelibifir.ru/strik, is likely part of this malicious infrastructure. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=is+a+cation+or+anion
    • https://wufopuse.weebly.com/uploads/1/3/5/3/135300065/kuzawepo.pdf
    • https://cdn-cms.f-static.net/uploads/4377662/normal_606b92a36f002.pdf
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/kamixezatu-zakuz-lawopuzibajokid-tugukabubisagag.pdf
    • https://cdn-cms.f-static.net/uploads/4393639/normal_603a9e0b7e8c8.pdf
    • https://siwelizotelet.weebly.com/uploads/1/3/1/4/131437983/dewudetop.pdf
    • https://static.s123-cdn-static.com/uploads/4455208/normal_5fe4512ebbaff.pdf
    • https://cdn-cms.f-static.net/uploads/4464055/normal_600fbd7ee6432.pdf
    • https://cdn-cms.f-static.net/uploads/4446492/normal_5fd31cd81cb5e.pdf
    • https://static.s123-cdn-static.com/uploads/4375521/normal_5ff4358aa0639.pdf
    • https://cdn-cms.f-static.net/uploads/4406787/normal_605306c4c7f9c.pdf
    • https://cdn-cms.f-static.net/uploads/4454045/normal_603849fa891fe.pdf
    • https://cdn-cms.f-static.net/uploads/4393044/normal_60220747c84c9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/juzinaramip/amsco_us_history_chapter_2.pdf
    • https://s3.amazonaws.com/vazisi/16890804115.pdf
    • https://uploads.strikinglycdn.com/files/8f59d784-bb73-4f28-8445-1cb667cfe3cc/wefexakosuvovil.pdf
    • https://uploads.strikinglycdn.com/files/3b14fcd1-48e8-4175-b3e5-168bf790e46a/work_and_energy_physics_worksheet_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/38e07b53-4de7-4004-8cff-10fa1d9206dc/80946743078.pdf
    • https://s3.amazonaws.com/jijari/longman_dictionary_of_contemporary_english_drive.pdf
    • https://uploads.strikinglycdn.com/files/9054cd2f-6549-4f53-aa5e-c877fbe8a97c/how_do_i_contact_geek_squad.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8cc.bin
677eb3099e7a571caf038e03d586b9552f48f6e52a950b127797531d668fe97f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 4368 bytes
font_01_sfnt_off0000f78a.bin
c03154ec2a392a34f020f3f95a843bce056bd4ce64f68d64108f42029c84444d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 10820 bytes
font_02_sfnt_off00011be5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 4324 bytes

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