Malicious PDF — malware analysis report

Static analysis result for SHA-256 a619d5b629c81c71…

MALICIOUS

PDF

73.4 KB Created: 2021-02-16 17:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b8675e03ef0618aa27c472ba74f1197f SHA-1: 2156caf54b7ac07d77d1540b57e4da375002c8a9 SHA-256: a619d5b629c81c71b63533189b990606098d71f9d282bdf469ffb1485d434568
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The document body, though heavily obfuscated, appears to be a lure related to online selling. The presence of numerous links to external sites, including a critical finding of a malicious redirector, strongly suggests an attempt to direct users to malicious infrastructure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+sell+on+facebook+marketplace+fast In PDF document text
    • https://tofabefanij.weebly.com/uploads/1/3/4/7/134726630/dirigasozawivirenas.pdfIn PDF document text
    • http://easy-money-cash.space/xotimejawimogan947qz.pdfIn PDF document text
    • https://nizakibete.weebly.com/uploads/1/3/4/3/134386075/6213004.pdfIn PDF document text
    • https://xifupanudolegu.weebly.com/uploads/1/3/1/1/131164204/nanufaduxop.pdfIn PDF document text
    • http://vulgargirls.fun/96182310953gkfex.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/I0ziiiU/beli_pulsa_pake_gopay_di_alfamart.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/sijiAhh/current_command_master_chief_of_the_navy.pdfIn PDF document text
    • https://rotiwoluxifu.weebly.com/uploads/1/3/4/5/134525243/5992674.pdfIn PDF document text
    • http://monoga.space/deforestation_and_desertification_ielts_reading_answerk1np7.pdfIn PDF document text
    • http://lovelid.xyz/neverwinter_chult_hunt_rewardsjcrvg.pdfIn PDF document text
    • http://front-glass.website/nirvana_nevermind_zip_downloadp0rj6.pdfIn PDF document text
    • https://titugujogimob.weebly.com/uploads/1/3/4/0/134017720/munofumupofedemu.pdfIn PDF document text
    • https://zujamabosav.weebly.com/uploads/1/3/4/3/134363941/fativomo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lironif.epizy.com/wegafomojuv.pdfIn PDF document text
    • http://janarisugikev.rf.gd/bestandsgrootte_verkleinen.pdfIn PDF document text
    • http://siverudatowu.rf.gd/abandoned_full_movie_2019_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_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 5416 bytes
SHA-256: 4e500740bccb60461d62834a88d09f0430f727aa9ef7b4238531f3d03965d666
font_01_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 10572 bytes
SHA-256: 3b3afd627997638af28ed7636b9935a95e6b7a32ddf19bc8a45f26f094eee3cd

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