Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7791f6f88de0bb2…

MALICIOUS

PDF

80.4 KB Created: 2021-04-05 14:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e4cd7754270008c62eaeba2289554a28 SHA-1: dcee139ab10d4e4d739989533616818507c5add4 SHA-256: b7791f6f88de0bb2810e84abacd27031917bcccddb9ab55fcf2885cf013d8ca8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the 'Pdf.Phishing.Trojan' detection suggesting a phishing or trojan distribution purpose. The presence of embedded URLs and the overall structure point towards an attempt to lure users to external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/strik?utm_term=dark+sun+2e+books PDF link annotation
    • http://veviwumifuvemuz.mypressonline.com/62491340655.pdfIn PDF document text
    • http://chestlune.online/blade_and_soul_warden_pve_guide604xi.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/HBBifch/damoralokemexumirojoz.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/8507151.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/XMlifgi/zewegitosupizipulukiwa.pdfIn PDF document text
    • https://wiwupaluw.weebly.com/uploads/1/3/1/6/131606778/zejogotefi-xijen.pdfIn PDF document text
    • http://avtoshkola-region26.ru/iso_27001_framework_controlseilk1.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/ctTIgjg/level_maker_mod_apk.pdfIn PDF document text
    • https://viwoseloza.weebly.com/uploads/1/3/4/8/134861971/kimawedumonode.pdfIn PDF document text
    • http://pek-24.cc/nifty_technical_analysis_software_freeumgsr.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/a3ifOuZ/hollywood_16_movie_theatre_ocala_fl.pdfIn PDF document text
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/futirotisazu.pdfIn PDF document text
    • http://optalpha.com/51699290116e3kwt.pdfIn PDF document text
    • https://cdn.sqhk.co/safajoju/nv8I1Kz/zevikedobe.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
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_8a9b91a6bf7440a7ae45138c665e64da.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_1a9740e0893847dba4a16822ebb883f4.pdf?index=trueIn PDF document text
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_b2b63eec196a412abb5b5807e406ca88.pdf?index=trueIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_653d47e6aca54aff85f75510730ad48a.pdf?index=trueIn PDF document text
    • http://xizokenimufewom.atwebpages.com/short_biography_books.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_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 4736 bytes
SHA-256: 90e4163774147ee78d42dfe494cad713d479cb2873e94c257310a74474406e1b
font_01_sfnt_off0000ff0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 11148 bytes
SHA-256: 9468638690205a832c2d5a0f5a90c300fb4562bed93af7add62411f2ba88ef79
font_02_sfnt_off000124e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378