Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc18f4ac2734550…

MALICIOUS

PDF

124.3 KB Created: 2021-03-19 06:11:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 693822a0b77de47cfb678b01dd8bf13e SHA-1: d2b3242614df0c7d47b0edb89d621c754a6d5927 SHA-256: fbc18f4ac273455068d8e30faa706906f7406b2db261c074be5d30cf8a7ac38c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier also strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=aaa+travel+guide+chicago
    • http://lunesygets.xyz/fifawewamajolumabo6b1cx.pdf
    • http://remeik.ru/new_android_mobile_phones_under_15000u2z2y.pdf
    • http://usesalon.xyz/48025880844vz8qi.pdf
    • https://static.s123-cdn-static.com/uploads/4368999/normal_5fe3dbe1b25a4.pdf
    • http://podipotekoi.ru/842686252324v5y.pdf
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd148b7366a1.pdf
    • http://blockingscenery.com/palaxanerusetaxevefezifasmkz0a.pdf
    • https://cdn-cms.f-static.net/uploads/4490264/normal_601cce7950a65.pdf
    • https://cdn-cms.f-static.net/uploads/4367643/normal_6046215865e19.pdf
    • https://cdn-cms.f-static.net/uploads/4487623/normal_600d90697df7c.pdf
    • http://djami.ru/how_to_get_a_referee_license_for_socceryftk1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_f71adeba9a774141922fcf789289bdf1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2c547665-3157-4e41-be48-1982cef3f0f5/new_king_james_study_bible_thomas_nelson.pdf
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_943a8cf645af464f8663998154a39f52.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8ee3f21a-a2f5-4c9b-af2b-ae3890ed69b5/how_to_replace_jenn_air_dishwasher_handle.pdf
    • https://uploads.strikinglycdn.com/files/04938e7c-7a33-4754-8d66-f5e4fe2dfc1b/cozi_tv_new_schedule_january_2020.pdf
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_92b6747224524df8b4e7100ede3cce79.pdf?index=true
    • https://uploads.strikinglycdn.com/files/03093886-49e5-4a17-82c9-aa740f44c1dc/solution_definition_math_for_dummies.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a9c5.bin
6cc074d99eaa538b64bcb8fbbedf174d14418eb31a550b4e6ff61c0a0a9212ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9C5 5072 bytes
font_01_sfnt_off0001bb04.bin
89c365a9ab945aad3846d1d7dcc34d28d28ee450fd3193a0bd574d06f3238c46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB04 12004 bytes

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