Malicious PDF — malware analysis report

Static analysis result for SHA-256 a360c32071864443…

MALICIOUS

PDF

68.2 KB Created: 2021-02-26 05:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e44d2f484a30e21a0c4e749e6ff20959 SHA-1: d1d220bf96ff2f84107cc47496d5749325f7a198 SHA-256: a360c320718644437c4685d56e3b9b976486d6b3260293b98bd9fad6517e2dcd
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one directly links to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to downloading a textbook, which is a common tactic for phishing or malware distribution.

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
  • 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 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/123?utm_term=fundamentals+of+thermodynamics+9th+edition+pdf+free In PDF document text
    • https://gavevuroboba.weebly.com/uploads/1/3/5/9/135959422/mulawoto_womagox_bakogosonegubep_ronatag.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/lekifalapulifez.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/vileban.pdfIn PDF document text
    • https://zisetilu.weebly.com/uploads/1/3/1/3/131382786/8761314.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/jibufizosixunal.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/kuziwavoxezigagoke.pdfIn PDF document text
    • http://dunetetemob.22web.org/deziza.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/qgjMSNm/12079724199.pdfIn PDF document text
    • https://jabekidedur.weebly.com/uploads/1/3/1/6/131636775/tezojinu.pdfIn PDF document text
    • https://nilijinaxobizag.weebly.com/uploads/1/3/4/3/134356504/64bbf.pdfIn PDF document text
    • https://gekaketiba.weebly.com/uploads/1/3/1/4/131455198/3164293.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/kibokita.pdfIn PDF document text
    • https://salubekera.weebly.com/uploads/1/3/2/7/132740515/9594118.pdfIn PDF document text
    • http://istlan.space/attitude_status_marathi_dostipdouz.pdfIn PDF document text
    • http://myluckybet.xyz/diburogejaxaf6nzsb.pdfIn PDF document text
    • http://chambreapp.xyz/803284042983xss.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sufojokene.rf.gd/pelipafu.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_off0000cc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 5608 bytes
SHA-256: c33bfd1d496f383cdcb2515edc1be31aaf84c36d49927495aa45870af6f56004
font_01_sfnt_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 10416 bytes
SHA-256: f4e62b62e2d02b4a0f04cc7f9994b96c2b8cf0eda79cc3ce906736f0174be5c2

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