Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a3b38905ba2e73…

MALICIOUS

PDF

71.0 KB Created: 2021-03-03 06:55:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 884a64a16635956076bd9f66846eb797 SHA-1: 6c6d4e61a46fa861e6eb4096e3e362ac91ce81fa SHA-256: c8a3b38905ba2e738cdfea96011bff7e43bb6b687bebf1151cf924a6a67c8b0b
134 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains multiple external URIs, including one identified as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The presence of urgency lures further supports this, indicating the document is designed to trick the user into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lozipotod.ru/aws?utm_term=jbl+sb400+remote+control PDF link annotation
    • http://vagivosifogezer.22web.org/nutrition_information_wendys_chili_small.pdfIn PDF document text
    • http://razixir.22web.org/6342258919.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/Ahjjaja/soguperowumedovapipab.pdfIn PDF document text
    • http://chatik85939775.fun/56503697306znnrq.pdfIn PDF document text
    • http://itravelimpressions.com/lavitazobixibevisufp1ltq.pdfIn PDF document text
    • http://towumodoxilokox.22web.org/gowuzolonilawupunixekenip.pdfIn PDF document text
    • http://pafekusiwajida.66ghz.com/current_college_student_resume_template.pdfIn PDF document text
    • http://vigastlens.xyz/enders_shadow_series_box_seteftmo.pdfIn PDF document text
    • http://gawuguvososu.iblogger.org/77581167794.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wogafut.rf.gd/judafexodiwabam.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/soxetukelufemamulinu.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/46406120657.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/kooltherm_pipe_insulation_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/nezigogemobe.pdfIn PDF document text
    • http://lisotabisalak.epizy.com/jakexatagidusanurito.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/69638447321.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98D 4832 bytes
SHA-256: e9e772c806432dcd1ff46d1691ec014f819ad4cf9d091fb6975a24236e6dca48
font_01_sfnt_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 11804 bytes
SHA-256: df85cdf81fbb43dae8df43533f2122ec34a3a09b899973f1ff1d86b14b749513
font_02_sfnt_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f