Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eaf0543580621cf…

MALICIOUS

PDF

82.7 KB Created: 2021-03-11 06:49:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3f157fc01ed1b7963a685e093cb01eaf SHA-1: 885143d56baad95058aabdc2223d9d4752650fdc SHA-256: 8eaf0543580621cff47fd4052db90c5203dfbb713613e9a9e6c3431b0bc99570
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://baarspo.ru/wb?keyword=autocad%20designer%20jobs%20salary', appears to be a lure for job seekers, likely leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wb?keyword=autocad%20designer%20jobs%20salary PDF link annotation
    • https://cdn.sqhk.co/tolononof/hgcLhjg/super_stickman_golf_2_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/cg6PVib/82426108637.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/ihFjd1z/t_mobile_deals_when_u_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/kenixidoxexi/idjjfSM/hakuouki_reimeiroku_season_1.pdfIn PDF document text
    • https://zuzilumapodebaj.weebly.com/uploads/1/3/1/3/131382406/xolizux.pdfIn PDF document text
    • https://viliwefat.weebly.com/uploads/1/3/1/0/131069961/4224996.pdfIn PDF document text
    • https://ruzutemeba.weebly.com/uploads/1/3/2/6/132681300/2213351.pdfIn PDF document text
    • https://dazutexigamufo.weebly.com/uploads/1/3/2/7/132740900/gizujinexobafoloworo.pdfIn PDF document text
    • https://dupudebokuvufex.weebly.com/uploads/1/3/2/3/132303235/xotejekal.pdfIn PDF document text
    • https://vetazewufa.weebly.com/uploads/1/3/2/8/132814418/fukeradenidu_rizum_naxosaratoruso.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/iigdVhj/skulduggery_pleasant_movie_auditions.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/OlWsFia/2014_super_duty_towing_guide.pdfIn PDF document text
    • https://garowowo.weebly.com/uploads/1/3/6/0/136033653/rifono.pdfIn PDF document text
    • https://cdn.sqhk.co/negolura/dzkrfia/xegemivijetajomat.pdfIn PDF document text
    • https://cdn.sqhk.co/taxeseta/Oyjh75M/adorn_font_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_47d5890cd290475bac3f0d67e61c0c20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujanozo/email_acknowledgement_reply_template.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_be588e4b4be141ba8568325f8f768879.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/vidmate_old_version_1._47_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/jet_airways_case_study_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/invitations_templates_for_baby_shower_free.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_9bcaac35bdab4a9b9cab5b0751cd5112.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_0753ea8f874c41a6b475c167ae9dbe90.pdf?index=trueIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_5bfcbdc3365244e7bc60908d1be5f402.pdf?index=trueIn 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_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 5416 bytes
SHA-256: d956009121581fbe7c10670b2113af5e92ca3dec7557bf552fbc42427d360e69
font_01_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 10820 bytes
SHA-256: 02a07c05e0eb86a26e7ccfddac07632c36bb419a5e8260c19ff073c47588ee32