Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85f5280bfc50e36…

MALICIOUS

PDF

79.4 KB Created: 2021-05-01 16:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 30ff49161313c089c7aeef6d2c24ff92 SHA-1: d2bfcc8650795b4ac184214a4afd6e8107b0ad7f SHA-256: e85f5280bfc50e369576043c19d61ca6509b9643abcae8800214e95c66e26a09
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with several pointing to suspicious domains like jacksth.ru and logvoz.ru, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to a car seat installation guide, which is likely a pretext to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/strik?utm_term=safety+1st+guide+65+sport+convertible+car+seat+installation PDF link annotation
    • http://logvoz.ru/canon_in_d_piano_sheet_easy6fj7g.pdfIn PDF document text
    • https://xazebuwojij.weebly.com/uploads/1/3/4/4/134467588/2492866.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/tetobiligir.pdfIn PDF document text
    • http://geesecam.com/nokudermdmwz.pdfIn PDF document text
    • http://hightrade.club/frases_cotidianas_en_ingles9edst.pdfIn PDF document text
    • http://voruxajalo.iblogger.org/81440862901.pdfIn PDF document text
    • https://simisodiguguvig.weebly.com/uploads/1/3/5/3/135324772/42ea44de748664b.pdfIn PDF document text
    • http://nefritthebestthing.site/7594000892963hzg.pdfIn PDF document text
    • http://idealicacolumbia.site/20228117392d1fye.pdfIn PDF document text
    • http://all-system7.work/1l79o.pdfIn PDF document text
    • http://zuluwana.iblogger.org/possessive_pronouns_and_adjectives_worksheets.pdfIn PDF document text
    • http://texulateniz.iblogger.org/agustin_cueva_la_teoria_marxista.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/noxexola-biwujegazojojob.pdfIn PDF document text
    • http://cabinetshub.xyz/zavexojulu1uton.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/xupovobejanam/91175547242.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/62115535268.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/google_sheets_api_append_example.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/34264010480.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/dexavavususe.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/sims_3_wont_install_on_mac_2020.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_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 6056 bytes
SHA-256: ce213751cfe6ce22e4a3a1bcc465315233d1c0a14cd1a7d1ba7600e4d14ef2cb
font_01_sfnt_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 12688 bytes
SHA-256: 7af21b2ac67a799bb793d5283a996f86bf0c84043481c2da0c311e3dbf079b13

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