Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a07f3fc4500a0f…

MALICIOUS

PDF

95.5 KB Created: 2021-04-01 03:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7d8ce199918ad2b1638fab29a8516a49 SHA-1: 572591aa0e460a43c492863587900ab22e16bdcc SHA-256: 77a07f3fc4500a0f4f3a2a3c0b341502c67d68ec74066995cc9e5e94e3d9eb68
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be metadata rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=cahier+journal+4ap+pdf+2020 PDF link annotation
    • https://cdn.sqhk.co/mosepoxik/9jeigjg/bexarames.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/ihgegcp/hashtag_for_likes_and_followers_2020.pdfIn PDF document text
    • https://kakadolaronenun.weebly.com/uploads/1/3/3/9/133997154/namatafelaliwe-suguju-dakexalokepus-ramexid.pdfIn PDF document text
    • https://cdn.sqhk.co/tulazofava/whcdjfL/ironman_70._3_arizona_race_report.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekogi/ejihhuX/sikopolomegi.pdfIn PDF document text
    • https://cdn.sqhk.co/sidigodoga/LCjcF4n/age_of_war_5_free_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/ibhiQgh/94766797714.pdfIn PDF document text
    • http://zotoxilob.getenjoyment.net/debukonanasobi.pdfIn PDF document text
    • https://cdn.sqhk.co/jiledexuda/geIgjgf/altaf_hussain_hali_books.pdfIn PDF document text
    • http://forisawidokomor.sportsontheweb.net/27353621857.pdfIn PDF document text
    • http://dulisakip.medianewsonline.com/per_anhalter_durch_die_galaxis_buch.pdfIn PDF document text
    • http://circleshtang.xyz/277989883245va6o.pdfIn PDF document text
    • http://healthyforczechrepublic.site/sujomiduritunimaleragaopilv.pdfIn PDF document text
    • http://instas.site/443000876404enbw.pdfIn PDF document text
    • https://bokoxopeke.weebly.com/uploads/1/3/4/2/134266118/25c4f12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavalukato/wemamul.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/l298n_mini_datasheet.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/what_is_the_value_of_2007_toyota_corolla.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/nclex-rn_questions_and_answers_with_rationale.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000150dc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x150DC 19028 bytes
SHA-256: 156274db3ede66b3a0bbc0782e0cf138a04dcd21c3846bdbd23e6951f79aee6e
font_00_sfnt_off00010f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 5296 bytes
SHA-256: 241a82936b3d325a7f7f0fba95ff2cb974caf0796c6f9e81f6b24589e668dc75
font_01_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 15384 bytes
SHA-256: 171f3f27ab1ccb6753fe88c44ade4a0b5405a8c3fc89c695b5ebda2aacc0631f

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