Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19c860874d607c0…

MALICIOUS

PDF

68.1 KB Created: 2021-02-21 21:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 035d7e443fb6fc3601c03276ac35c4d7 SHA-1: e0af13d71895625b79d064e5cf223b9e8042505a SHA-256: e19c860874d607c047fac25d7755c46e286583055addde549443a156dc92f61c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The embedded URLs and the heuristic firings related to PDF link farms point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

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 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.
  • 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://bologen.ru/wix?keyword=vsphere+6+foundations+exam+official+cert+guide+pdf+download PDF link annotation
    • https://gomujivas.weebly.com/uploads/1/3/5/3/135321586/61122d2fe19fbd.pdfIn PDF document text
    • https://dopesitelubi.weebly.com/uploads/1/3/5/3/135307477/4f8e83b.pdfIn PDF document text
    • https://befugusugub.weebly.com/uploads/1/3/2/6/132683140/tikevilibironovugeju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384046/normal_5ff3ab5fa7933.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450415/normal_5fe535b2dc27b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405437/normal_5ff4582aec1bb.pdfIn PDF document text
    • http://piwudev.iblogger.org/zajobibujugiwasexemular.pdfIn PDF document text
    • http://logowiwubapokar.iblogger.org/cpso_continuity_of_care_guidelines.pdfIn PDF document text
    • https://gufonesugoxemi.weebly.com/uploads/1/3/5/9/135960051/c571e3ed.pdfIn PDF document text
    • https://roginolesalit.weebly.com/uploads/1/3/1/6/131636974/3614027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483365/normal_5fc8a9e558e96.pdfIn PDF document text
    • http://pusilawabozizur.22web.org/sisulegasoxupuzijalen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480161/normal_601d20d3e27c9.pdfIn PDF document text
    • http://zemawage.22web.org/5331063871.pdfIn PDF document text
    • http://hq-cleartv.info/rise_of_kingdoms_best_commander_pairs1u7xy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dupumimegijema.epizy.com/37978587677.pdfIn PDF document text
    • http://jeragapa.epizy.com/aagadu_movie_comedy_scenes_free.pdfIn PDF document text
    • http://pikazunelovo.epizy.com/bissell_deepclean_premier_pet_carpet_cleaner_17n4_manual.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_off0000ccad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 5848 bytes
SHA-256: cf3e63c468e0727cd65b937d727b646b60a45f333cb2c8d924c8faeb4d18228e
font_01_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 9916 bytes
SHA-256: b911f31d589232ae55d1d6a2ec8dc709567443d2c4f03cd94a2b5e2b112bff7a

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