Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b86331a0c37c97c…

MALICIOUS

PDF

84.3 KB Created: 2021-02-11 11:57:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4756935596663caca62165373613cfbc SHA-1: 0c3e07de9d1aa03c2d9217b4a11675b33fb229cd SHA-256: 9b86331a0c37c97c3517d32a2bf3722f58dc52aabcf5eef24d28816fe5589c7b
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's an XFA form and a link farm on disposable hosting. The embedded links, such as https://crophysi.ru/123?utm_term=probioslim+dr+oz, likely lead to phishing content. Although no scripts were explicitly extracted, the PDF structure and link farm nature suggest an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://crophysi.ru/123?utm_term=probioslim+dr+oz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410975/normal_6023cff1c38b8.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/saduwilazjc69g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_601b444d1c5eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415051/normal_5ff7e2dacee66.pdfIn PDF document text
    • http://playmarket-online.com/freakonomics_movie_worksheet_answersidomu.pdfIn PDF document text
    • http://adv-workshop.site/interstellar_soundtrack_piano_sheetrv7xz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_6011642567075.pdfIn PDF document text
    • http://xusatekekosigi.iblogger.org/2004_atp_iii_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_5fd9abcd9f6a1.pdfIn PDF document text
    • http://xbet1.fun/fl_studio_11_skin_pack_downloadxgy1b.pdfIn PDF document text
    • http://free-at.pro/livestream_studio_remote_guestpjrk7.pdfIn PDF document text
    • http://deluwotitawugo.iblogger.org/handwritten_cursive_font_free.pdfIn PDF document text
    • http://kalavar.xyz/rugadogotorufeped2nfu.pdfIn PDF document text
    • http://pevokepavaxe.iblogger.org/guardian_egyptian_font_free.pdfIn PDF document text
    • http://nikecortez.net/33566733486dpi3c.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://mukulug.rf.gd/parkour_maps_for_minecraft.pdfIn PDF document text
    • http://tibobabinenan.epizy.com/ffxiv_crafting_leveling_guide_leves.pdfIn PDF document text
    • http://muxolisakij.epizy.com/civilization_iv_colonization_strategy_guide.pdfIn PDF document text
    • http://disiroto.epizy.com/a-_ha_unplugged_summer_solstice.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_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 4436 bytes
SHA-256: 7af63c0ddd435df31849b83fa84a440085041b7e67eddd81c0f5f42dc0777da3
font_01_sfnt_off0001113a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 10820 bytes
SHA-256: cea277f277148ce10027686a88728035cbab0529302408e5bf782764025d5a05
font_02_sfnt_off0001357f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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