Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ada8e4f60b939f8…

MALICIOUS

PDF

84.5 KB Created: 2021-03-21 10:34:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a8f4e8b7b2e37edb634ed8b1c21f3cf1 SHA-1: c95717747464dd068049e28a7af9ca44a4e90294 SHA-256: 7ada8e4f60b939f88ee11d5f995d678b8e6d319a48bdd9385a0fa633a8b57552
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one specifically pointing to 'zajinet.ru/strik' and containing a UTM term suggesting a download lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

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://zajinet.ru/strik?utm_term=download+khi+%25C4%2591%25E1%25BB%2593ng+minh+nh%25E1%25BA%25A3y+v%25C3%25A0o+pdf PDF link annotation
    • https://xizovetezewo.weebly.com/uploads/1/3/2/8/132814166/taxorexokudox.pdfIn PDF document text
    • http://metryck.info/zifozobofizixepujorusubm4ht.pdfIn PDF document text
    • https://fudafovagovareg.weebly.com/uploads/1/3/4/8/134868702/edbe73f818.pdfIn PDF document text
    • http://nukicew.xyz/luwixujg983.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/vuxonelovaxezokugowi.pdfIn PDF document text
    • http://art-practice.org/introduction_to_exponential_functions_common_core_algebra_1_homework_answersfs66e.pdfIn PDF document text
    • http://fofumumitem.medianewsonline.com/maternity_leave_application_letter.pdfIn PDF document text
    • http://ig-copyrightnotice.com/words_to_describe_sunbeammhx1l.pdfIn PDF document text
    • http://basumoxivor.sportsontheweb.net/rilkes_book_of_hours_love_poems_to_god.pdfIn PDF document text
    • http://harmony-market.ru/rezaxakusevotidif2d6nd.pdfIn PDF document text
    • http://italywow.space/basler_electric_120v-_12v_transformerto332.pdfIn PDF document text
    • http://doordash.fun/fegedutaxolavulijurexuxen8y496.pdfIn PDF document text
    • http://startask.ru/air_force_1_low_white_mens_near_me8rxhv.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/kiwopusafize/67880741965.pdfIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_96edf4b2055f4a84819e1ff8258a7c4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kaxukok/yamaha_mixer_mg10_2.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_a91d311f47e444aea3f0ef3aacf8b233.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_61d64139c4e541bbb16303b0d7c9ecac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/domasitawuluvakagujovitir.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_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 6320 bytes
SHA-256: 0282491e8e3ae514cbe00df58dd5b95406aceefea856959b6e93298fc20d8831
font_01_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 23872 bytes
SHA-256: cbc01dcb1ffa46f45b2007f71e9fc1e108571a44dc38dd4f005bcf925d05b5d1

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