Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c4d9b1c22fe49b…

MALICIOUS

PDF

73.8 KB Created: 2021-02-19 22:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e784248af218bde86c855c766f29956e SHA-1: 2461cfe0840bd40a77be2d3fd6f53bfe70247587 SHA-256: 82c4d9b1c22fe49bef293e5a250f00157238e2702aa63f61e078464c6185c915
126 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 numerous external URIs, with a prominent one being `https://jottigo.ru/strik?utm_term=ge+xl44+f2+error`, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and appears to be a malformed error message, further supporting the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jottigo.ru/strik?utm_term=ge+xl44+f2+error PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403817/normal_5ff4b4bb7352d.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/8689007.pdfIn PDF document text
    • http://guitar.su/134124756589f5vh.pdfIn PDF document text
    • http://vinorama.fun/latest_mac_os_high_sierragaq4j.pdfIn PDF document text
    • http://stopnutristrike.ru/godutogowogobexfd1q2.pdfIn PDF document text
    • http://tameenegypt.com/vanofajekozuyu2wi.pdfIn PDF document text
    • http://xugutolajon.22web.org/fender_passport_p_250_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449417/normal_60089a585372f.pdfIn PDF document text
    • https://sojanonef.weebly.com/uploads/1/3/0/9/130969598/rejipozugufapeb.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/3191095.pdfIn PDF document text
    • http://magnetfix.store/aloe_vera_gel_flpgqcsa.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/9da5f16340d461c.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/petivixft1.pdfIn PDF document text
    • http://erethiztzj.space/heng_long_m1a2_abrams_manual210ot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memilupa.rf.gd/7313591896.pdfIn PDF document text
    • http://jugorufu.epizy.com/break_up_whatsapp_status.pdfIn PDF document text
    • http://vasetirepevomeg.rf.gd/kingdoms_of_camelot_wilds_attack_guide.pdfIn PDF document text
    • http://kakapefetabol.rf.gd/red_letter_bible_study.pdfIn PDF document text
    • http://loletusu.rf.gd/wekerixunorerixuluginig.pdfIn PDF document text
    • http://saxuvoluzoz.epizy.com/87659295402.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_off0000d08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08B 4692 bytes
SHA-256: b57c71ee017883d50d65be5d260e5c692d56265a17d51e1d98d945e049785b34
font_01_sfnt_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 10136 bytes
SHA-256: fb3f00504b8520b3fd012220ea5f3a50c887e8a2c9da17f95f533d1ea25c21b4
font_02_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 16108 bytes
SHA-256: 4f5c2c46fc1bea6d698c84397e6c96550f3662020a851a1cfd21f277ee06805a

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