Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cfcc0a4958f689…

MALICIOUS

PDF

75.1 KB Created: 2021-03-26 09:15:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b238561e6c0198c8a67c390aa66f734 SHA-1: e2c0c276cf1e79188346a805bf88f5a194540924 SHA-256: c2cfcc0a4958f689f759e47c5225d574fa8ace2c453b49ceca68610ede799ad7
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URIs, many hosted on disposable domains. The document body, though heavily obfuscated, appears to reference a '1998 nissan frontier repair manual', suggesting a lure to trick users into downloading further malicious content. The presence of multiple external links and the link farm heuristic indicate an attempt to distribute malware or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://pelibifir.ru/wix?keyword=1998+nissan+frontier+repair+manual
    • http://zunuruxeguxifi.mygamesonline.org/calculus_one_and_several_variables_10th_edition_solutions_manual.pdf
    • http://dalnoboyi.xyz/lalikividojuhpb7.pdf
    • http://japamawosoj.mygamesonline.org/editorial_essay_example.pdf
    • http://knitfqph.site/kapansrlop.pdf
    • http://noxaduva.mypressonline.com/24348061014.pdf
    • http://podarokinsta365.site/wahl_clipper_blade_sharpening_ukcp9gh.pdf
    • http://gakagebir.mypressonline.com/im_ok_youre_ok_summary.pdf
    • http://koreanluxe.com/lebidopakuzemegekixemeo43w3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sawurawefivovo.myartsonline.com/26185282776.pdf
    • http://boxemoje.epizy.com/26379469453.pdf
    • http://gefuwaw.atwebpages.com/le_bouddhisme_sotrique.pdf
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_6a24f0dbbfca47cfb6a1808af1987ca5.pdf?index=true
    • http://rikovinob.epizy.com/kezodosijapidol.pdf
    • http://lalugutur.rf.gd/fifty_shades_darker_free_download_300mb.pdf
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_d27e3ef0f10e4a28b4329b2db761487a.pdf?index=true
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_ac3d51f9b36f4c9cb69e31c6c23316cc.pdf?index=true
    • http://jetelusaxidu.epizy.com/49093317412.pdf
    • http://keregimuw.onlinewebshop.net/pedagogy_of_history_book.pdf
    • http://relurifiluxel.epizy.com/pigofajufoxudeje.pdf
    • http://posikin.myartsonline.com/rivazev.pdf
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_ab2c3a3c20514ffe9c348807e6a6a4c0.pdf?index=true
    • 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_off0000db8a.bin
c56fdb1f87a5734fdceed1fecb346a67697e02ada46850c045df970b4f98ccc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 5236 bytes
font_01_sfnt_off0000ed33.bin
a8f571428b62d5f5652ec946433eb6e83c9698b1f136ca54f906f6706cd8ccfe
pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 10328 bytes
font_02_sfnt_off00011065.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 4324 bytes