Malicious PDF — malware analysis report

Static analysis result for SHA-256 678d995ac2f41cc0…

MALICIOUS

PDF

77.0 KB Created: 2021-04-03 12:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 41f98e75550f8c8b06c6a72508ca9dfb SHA-1: bb0a8168baf3123ab5b7ed835d8f61b2cfe5b2a9 SHA-256: 678d995ac2f41cc07ce08f5e3fd8c7bd770f26c9f262f92980632ae8b6feb536
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://maypoin.ru/award?keyword=core+java+interview+questions+pdf+for+2+years+experience PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410441/normal_6038e5da3e127.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/8Pjaij2/tap_chest_idle_clicker_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_605072ac70a53.pdfIn PDF document text
    • https://lekaretuzej.weebly.com/uploads/1/3/0/7/130738752/85857.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/fofozugiwuka.pdfIn PDF document text
    • https://gaxezoxo.weebly.com/uploads/1/3/0/7/130776828/biguwibijuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/dobexesi/DDhcGeL/misodorevedora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_600ddbab9cb14.pdfIn PDF document text
    • https://cdn.sqhk.co/kapipota/ijcjdwM/lurelelexotatebazimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_600ebc04d91cb.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/trutech_under_cabinet_tv_dvd_combo.pdfIn PDF document text
    • https://xizirasifeda.weebly.com/uploads/1/3/4/3/134344010/figuzep.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/icPTmj8/dental_assistant_programs_in_nc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471455/normal_60393e0073680.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/fifomi/94846435255.pdfIn PDF document text
    • http://visejatuvun.rf.gd/cuisinart_ice_cream_maker_model_comparison.pdfIn PDF document text
    • http://mawugosujutesag.epizy.com/lovatojineriselam.pdfIn PDF document text
    • http://pigutun.myartsonline.com/59487984131.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/how_to_reset_netgear_extender_wn3000rpv3.pdfIn PDF document text
    • http://xolilevifiw.rf.gd/what_are_the_four_fundamental_operations_in_mathematics.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/nigujadorowemuposabikut.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/52733611229.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_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 5676 bytes
SHA-256: ebff196e9f03592c33ed749568e132f00a214c0dc5ed1fddd79323011dfb6549
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 11032 bytes
SHA-256: b10b436b31c5099a7047255e449ff7074815dd6d4f5dcce5b61b5ff9d0f09b09

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