Malicious PDF — malware analysis report

Static analysis result for SHA-256 78494906b9c0cfe0…

MALICIOUS

PDF

75.1 KB Created: 2021-03-18 04:06:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: edf7ab34cedd5b7c8d8940a8e1015686 SHA-1: 5a3eec4b0f2e2b971280dcbfc6d680630c532aca SHA-256: 78494906b9c0cfe027756d925212f2a46b18944ebe0bc2b5aaa199d992556c2e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/123?utm_term=new+odia+song+2018+video++mp4 PDF link annotation
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/70aa282a5ce74.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/zivopozuba-rasabasafek-sibox-sibijenexedijud.pdfIn PDF document text
    • https://lopomibuliwipa.weebly.com/uploads/1/3/1/3/131381919/vurares.pdfIn PDF document text
    • http://espaceabonne.com/vewebixavujosogk7ap.pdfIn PDF document text
    • https://rudagaje.weebly.com/uploads/1/3/4/3/134310377/dekidefop.pdfIn PDF document text
    • http://pycnidwzxc.info/writing_samples_for_middle_school_students22e7u.pdfIn PDF document text
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/fapuxumimorolaler.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/1d30f9f3.pdfIn PDF document text
    • https://malegudupo.weebly.com/uploads/1/3/0/8/130813961/1079768.pdfIn PDF document text
    • http://natural-shop.info/ikea_malm_storage_bed_weight_limityzuwj.pdfIn PDF document text
    • http://powerhdniy.space/24679296429ctgyy.pdfIn PDF document text
    • http://shtancircul.site/26259816621xx852.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_89d5dbe95b1a4f818da50891e538b41a.pdf?index=trueIn PDF document text
    • https://26c1fd44-f1f9-4ef6-a882-042d00523970.filesusr.com/ugd/e2f197_692d25af753c45afbe0bc347c29a5347.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/rexatovakupuv.pdfIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_336e159f9d354cf989511790ba8384f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/penale/bumpy_ride_remix.pdfIn PDF document text
    • http://pidosowot.epizy.com/58743241891.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/jimowux.pdfIn PDF document text
    • http://nabunuwo.epizy.com/first_birthday_invitation_templates_online.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/bismillah_song_dance_performance.pdfIn PDF document text
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_fdfe57b33a164a3aaa8e56d63e8e3361.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/ti_84_plus_ce_emulator_android.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_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 5880 bytes
SHA-256: 671e96e35af9f7b9c712a26f1243fa625068ef8753bbb343e68b70c094149d38
font_01_sfnt_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 10008 bytes
SHA-256: 0cec2eea1cd3353941264927e9ab5be50963a4ed2d9c17fcb78ca6dd81253631

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