Malicious PDF — malware analysis report

Static analysis result for SHA-256 13169163e9c94336…

MALICIOUS

PDF

100.9 KB Created: 2021-03-15 18:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 30ccb65855aa64707cc04c4d59a0c481 SHA-1: ab8dde3b45297c74434918b16b35571bd9e1caf6 SHA-256: 13169163e9c9433640793a2b37577882a53aedc5687b6404bb2aaff0af1dd601
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://ponafet.ru/award?keyword=all+about+catfish+farming+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368506/normal_60322ba4dad38.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/96189a5e.pdfIn PDF document text
    • https://lulexabike.weebly.com/uploads/1/3/1/4/131407361/vobawaposise_birar_fixoz_nofaz.pdfIn PDF document text
    • https://betagoguf.weebly.com/uploads/1/3/4/6/134668965/371ab85db.pdfIn PDF document text
    • https://numuluga.weebly.com/uploads/1/3/4/3/134307024/5465012.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/60691153485.pdfIn PDF document text
    • http://vasamekekegu.iblogger.org/97740604267.pdfIn PDF document text
    • https://wilibuluso.weebly.com/uploads/1/3/6/0/136086636/5060712.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/nogetomezudu.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/27563715965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_6049232b62ff8.pdfIn PDF document text
    • http://finonit.mypressonline.com/how_much_do_navy_seal_make.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/dejejofemujijabufa.pdfIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_80def07b08db4ab4a4480058250c3102.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifamomove/katozatisibimis.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/burupexa.pdfIn PDF document text
    • http://weverikovufom.rf.gd/44858370627.pdfIn PDF document text
    • http://sarirepenibe.epizy.com/17202360812.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/sema_2018_exhibitor_manual.pdfIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_73f8727bd6bb42138a6d330c15a483f6.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_de861b436975488db8abcc9270b17be1.pdf?index=trueIn 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_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 5700 bytes
SHA-256: 5a2938e915010bdc7a0be701100ca11e4561194e9d40f65ead7c4d4101631249
font_01_sfnt_off00014713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14713 11632 bytes
SHA-256: e7adb15de562b6ec1d2a8cc14630abf28714d285c3ecbafbfe9cc8128409a7b0
font_02_sfnt_off00016f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F11 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd