Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c0031b389860f8…

MALICIOUS

PDF

80.6 KB Created: 2021-02-25 09:25:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 89bc4660719a17b137a51d39d9d88b0e SHA-1: 257875b0fcdb59b494edb99760d0cb3fbcd69ea4 SHA-256: d4c0031b389860f8c402b14af740e208fdcf2131165a492537e1741f8cd89dde
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or redirecting users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

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 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.
  • 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://maypoin.ru/123?utm_term=matt+cutts+try+something+new+for+30+days+essay PDF link annotation
    • http://nizavevorupuj.mywebcommunity.org/navuzigijazap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465270/normal_60339b6de408c.pdfIn PDF document text
    • http://x-bionic.shop/the_last_question_short_story_summaryu8sra.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456116/normal_601304f6c47ea.pdfIn PDF document text
    • http://dashcamtopbest.com/classified_narrative_format_balance_sheetbwiw5.pdfIn PDF document text
    • http://hurleyshamburgers.com/265755233105361r.pdfIn PDF document text
    • https://dafizigupiteg.weebly.com/uploads/1/3/4/4/134492389/ligumosazebu.pdfIn PDF document text
    • http://magazinrf.xyz/zegubulopiqav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bunetexugefu.rf.gd/buzimi.pdfIn PDF document text
    • http://vawovujuju.rf.gd/tamil_english_dictionary_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/man-_portable_anti-_tank_guided_missile.pdfIn PDF document text
    • http://dowufinaj.rf.gd/what_happens_at_the_end_of_the_magicians_nephew.pdfIn PDF document text
    • http://napipipazapuka.epizy.com/motexeruz.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/50281968018.pdfIn PDF document text
    • http://vozuxekeve.rf.gd/60728930274.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 5908 bytes
SHA-256: 6e375a1c8c1efdf89ce6739cf0a700f1932fb1b6816c2752755a992848510964
font_01_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 10792 bytes
SHA-256: 98072e74e9af31d6e4346fb22e0970deb52af55e73c39b241bfba3c5a515f342
font_02_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 16176 bytes
SHA-256: 860feb1f802be4de6fd35592d6b37982de3c38ee7725b66d541969c0eb07e5de

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