Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a25a837e009c297…

MALICIOUS

PDF

82.6 KB Created: 2021-04-11 17:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fd1a9849127387c84a5edf2e7e283090 SHA-1: 23e186cf7c0d97f13190f2f8ef6f241fcf9c0a16 SHA-256: 7a25a837e009c297fd9c760e851ca1b04451fb3aaf0bc2e6a2c58492cdb44cd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement, common in phishing campaigns.

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 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://bologen.ru/strik?utm_term=easy+raw+vegan+recipes+for+beginners PDF link annotation
    • http://fotogodopuxet.iblogger.org/72753848859.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/5686705.pdfIn PDF document text
    • http://dosutomek.iblogger.org/tuweduxifuramano.pdfIn PDF document text
    • http://zomosidotewe.sportsontheweb.net/90810665211.pdfIn PDF document text
    • http://sagaxafemet.22web.org/soturepapomogejedoji.pdfIn PDF document text
    • http://beautysss.site/mickey_and_minnie_mouse_images_hde7uao.pdfIn PDF document text
    • https://wuwabisa.weebly.com/uploads/1/3/1/6/131606234/giwapekefi.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/lost_books_of_the_bible_the_great_rejected_texts.pdfIn PDF document text
    • http://tanubujurutemut.scienceontheweb.net/tamil_catholic_mass_prayers.pdfIn PDF document text
    • http://thechambre.xyz/kikivasolekaku9yahw.pdfIn PDF document text
    • https://pamokevavazodo.weebly.com/uploads/1/3/4/3/134386981/dewufu-davanatisozu-mozaf-lipesobulifupim.pdfIn PDF document text
    • http://claire-irk.ru/ohmeda_biliblanket_meter_ii_service_manualz1r7m.pdfIn PDF document text
    • http://phtech.site/vzxtr.pdfIn PDF document text
    • https://fuguxowaponiv.weebly.com/uploads/1/3/4/6/134648792/69e05bb8cc4ad.pdfIn PDF document text
    • http://warokibujiz.getenjoyment.net/23569952942.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/xajowu/before_accepting_an_engagement_to_audit_a_new_client_an_auditor.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/lagu_cheating_on_you_charlie_puth.pdfIn PDF document text
    • http://pozenejuz.rf.gd/bach_cantata_146.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/ragnarok_eternal_devil_wing_quest_guide.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_off00012315.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12315 17624 bytes
SHA-256: 5da47786a09d9efa125fbd69014fa65bd21e1c975e35e8b23439c6221ea814c8
font_00_sfnt_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 5500 bytes
SHA-256: 94b2e4e7168b19c480cbbd3fc2c375eb4ba92b474bcc35093762a2e64444d34b
font_01_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 10540 bytes
SHA-256: c057294f37550865697b89a15f2c712ea44283c6d9a824373b8f59274c7504f8

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