Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce85a0d9276db5c…

MALICIOUS

PDF

80.2 KB Created: 2021-03-03 19:48:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8860beac5ebb51b43fd3bf102b41b8bd SHA-1: 4490be92fdd41705b26fa7ff7817a6bcddf43b99 SHA-256: fce85a0d9276db5c342cdd27a5d953ed7e35c52d81717339790828a38c434de6
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The PDF structure and the presence of external URIs suggest it's designed to lure users to malicious sites, aligning with spearphishing attachment tactics.

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 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://xajibur.ru/123?utm_term=who+is+the+foil+character+in+the+cask+of+amontillado PDF link annotation
    • http://lenuvivureropi.scienceontheweb.net/what_does_service_esc_mean_on_my_chevy_malibu.pdfIn PDF document text
    • http://dakajak.medianewsonline.com/netinutonagezixesowu.pdfIn PDF document text
    • http://numulul.mygamesonline.org/how_to_size_m50_gas_mask.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467306/normal_600fb6b04e223.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/pukes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_6020b7b174c6f.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/4502d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467285/normal_5fc866be8cf41.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/plantronics_cs50_cs55_replacement_battery.pdfIn PDF document text
    • http://wotaxatumumodok.sportsontheweb.net/how_to_get_vrchat_avatars.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391907/normal_5fe3451261ed9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_5fd6dcf03cc4e.pdfIn PDF document text
    • https://cdn.sqhk.co/vetejevibas/ozifNii/bedaxakejorividewuzil.pdfIn PDF document text
    • https://badetujunomut.weebly.com/uploads/1/3/1/8/131857650/4646513.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/gggjhhe/60542764070.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/xjmkbjf/honey_bubble_tea_in_chennai.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mobosefevexaxep.rf.gd/matilda_roald_dahl_book_review.pdfIn PDF document text
    • http://terofiwewu.rf.gd/how_to_rotate_guided_reading_groups.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_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 5340 bytes
SHA-256: a03f4f717d4d4cb5a8f48a6ec95f616c8944a2b29f8fbd67ae741f3abeae490a
font_01_sfnt_off00011052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 10272 bytes
SHA-256: 867833b0af027b7b652286a77ec963e6c1941e4216f4070d49d3a11a337765c6

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