Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4a6411d95a4fa2…

MALICIOUS

PDF

78.3 KB Created: 2021-04-17 02:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 67a7b5792b2ccabc90e99c6db438ea1b SHA-1: 252a3b244e400d333f7d8ead0c3a170b70ba2c6a SHA-256: af4a6411d95a4fa2fc3431227ea7a187ff7eb84e0ec9890a24fac2793c62a21c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spamming operation. One of the primary URLs, 'https://seumenha.ru/strik?utm_term=jonathan+edwards+sinners+in+the+hands+of+an+angry+god+quotes', appears to be a redirector. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/strik?utm_term=jonathan+edwards+sinners+in+the+hands+of+an+angry+god+quotes PDF link annotation
    • http://redirunna.xyz/resavijilikogizim5veyg.pdfIn PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/331d7.pdfIn PDF document text
    • http://wowovamofuzo.sportsontheweb.net/adobe_acrobat_pro_extended_to_word.pdfIn PDF document text
    • http://sayfelengs.space/lezuwaxazobaxofenedavaj2bqxv.pdfIn PDF document text
    • http://manapuzasupin.sportsontheweb.net/the_fiery_heart_bloodlines.pdfIn PDF document text
    • http://wirelessinfo.ru/vabajasebobav5qo7x.pdfIn PDF document text
    • https://dotomogef.weebly.com/uploads/1/3/4/7/134760479/roxozu.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/7a69aaada9.pdfIn PDF document text
    • https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/loxivabut-muropadolotipon-jiveboziludam-pesipepom.pdfIn PDF document text
    • http://criticcxck.space/zolazubakixapatunegima2ayh.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/9494174.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/2234951.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/jarabufog.pdfIn PDF document text
    • http://usesol.xyz/245633574259r3xz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/dabeleromoxesisezaju.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_deea1df8c250473990feabf37fd4e793.pdf?index=trueIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_05a76c9367ab476b8be5a3a515562c09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopeteb/94868516860.pdfIn PDF document text
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_d04e907da91347b99b227bb57a020fbc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/68956359327.pdfIn PDF document text
    • http://lumalidik.atwebpages.com/human_anatomy_atlas_2020.pdfIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_97c0a26bb962411683e14628294fd152.pdf?index=trueIn PDF document text
    • http://jezevenakos.myartsonline.com/87135048315.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/2010_triumph_bonneville_t100_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/66972225475.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_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 5448 bytes
SHA-256: 26ead9947faf4da9f619c2250397780eee9dc78e831b92b853e82a943e12feb9
font_01_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 12488 bytes
SHA-256: 5083616759026c706c6c21902a2093fb9ff8ea2dbcd524ec6be9b59b6c932382