Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d6a3ecfc8ff41c…

MALICIOUS

PDF

69.5 KB Created: 2021-04-05 11:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c4919b3d687f27368b2f9571fb50351f SHA-1: 07f0262a3649687c1b4fd0d1084571c1edf02ad5 SHA-256: 67d6a3ecfc8ff41c7a3c73981a42bbde677880ae62abe90a6d39a9bbda61685c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a suspicious domain, identified as a phishing or malware distribution attempt by ClamAV and ML classifiers. The document body, though heavily obfuscated, suggests a lure related to an 'algebra 2 quadratic functions practice test', aligning with common social engineering tactics to entice users to click malicious links. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=algebra+2+quadratic+functions+practice+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474722/normal_6042119fa35df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448337/normal_6025f2a4563ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416125/normal_602dffa45fe4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://229013d5-0e14-4531-be8c-43df84542e77.filesusr.com/ugd/e4a895_7c73a58b36f0487dba4ac88549a8be43.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxorojero/lugelomokurakos.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_bc363b79212844158965691098156f9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwafo/73170978816.pdfIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_0676ac9f1dbe4aec9b3981bb6831524b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/fazigukaxisagilirewevor.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/blue_himalayan_netherland_dwarf.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_276f82f7ad06483298d830697c5f2022.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75257af5-d2ae-44c7-8802-7427c6680401/matodebip.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/newuvasufoziwire.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_8a384673828f4c76aadbab084c97fc60.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/proform_995i_wifi_setup_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b7364e8-03eb-4042-ad24-f08ba58ac5d4/default_combination_for_sentry_safe_s0210.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_off0000cfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 5712 bytes
SHA-256: 2d97f3cd4c0079ff013bf004d51d217b59ad93c2e4b8a4a92cda4b6dd2fd85cd
font_01_sfnt_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 10956 bytes
SHA-256: 0d8187c7d36059848d740f9ad5e7dd97409d6870f486815b27894d399cdbb0e4

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