Malicious PDF — malware analysis report

Static analysis result for SHA-256 9358250df5b11efe…

MALICIOUS

PDF

77.9 KB Created: 2020-12-27 03:15:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e55ea2d7ddeaf4e3b6de5eba1c9d536 SHA-1: 70e335b88d22fdb07bf007a0c3fc010ff35699b4 SHA-256: 9358250df5b11efeda386a7db7e863961a1648c03bc0b6f6c44e2fb4ab24af5f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external links, suggesting a link farm or redirection mechanism to malicious sites. The document body, though heavily obfuscated, hints at providing answers for a science textbook, a common lure for phishing or scam operations. No scripts were extracted, but the presence of many external URLs indicates a potential for downloading further payloads or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/aws?utm_term=conceptual+integrated+science+3rd+edition+answers
    • https://cdn-cms.f-static.net/uploads/4473053/normal_5fd1ff5642727.pdf
    • https://fofonamid.weebly.com/uploads/1/3/4/8/134869219/1d116562d.pdf
    • https://semirenuzunep.weebly.com/uploads/1/3/5/3/135325284/xadomifaxi.pdf
    • https://cdn-cms.f-static.net/uploads/4467286/normal_5fb67977b6034.pdf
    • https://cdn-cms.f-static.net/uploads/4462726/normal_5fa8dc067ea39.pdf
    • https://sekojufakov.weebly.com/uploads/1/3/0/7/130776719/jabimimuve_pakal_zized_pomodejexi.pdf
    • https://fevuleniwawe.weebly.com/uploads/1/3/4/4/134476097/74faf9c4bd7.pdf
    • https://static.s123-cdn-static.com/uploads/4369917/normal_5fdeed95b488d.pdf
    • https://pusobufuronuwu.weebly.com/uploads/1/3/4/4/134475569/3094926.pdf
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/bovomakatowatemixoko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d4cd7cda-38b2-428d-a3aa-d13b677ecae0/mbi_setl_med-i-bank.pdf
    • https://uploads.strikinglycdn.com/files/5e33f2c4-9ddd-4c48-a1b7-f39d54affe83/98615326819.pdf
    • https://uploads.strikinglycdn.com/files/3e680bdb-3f8d-463f-b9ae-451aef29019e/skyrim_se_xbox_one_best_load_order.pdf
    • https://uploads.strikinglycdn.com/files/ddb6aaf1-7c35-49bd-8766-99446edd4550/steri_strips_over_glue.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e432.bin
9126349583a41abd9fb3853d81066c120b0d221bf240ab5b500064a999f4c927		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 5400 bytes
font_01_sfnt_off0000f6a8.bin
8060084f1376f240020043537518e1669a434d521e87e2299503b9b326f93321		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 10904 bytes
font_02_sfnt_off00011c05.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C05 4324 bytes

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