Malicious PDF — malware analysis report

Static analysis result for SHA-256 a816604133a310ad…

MALICIOUS

PDF

82.4 KB Created: 2021-06-11 02:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a013f051a6479d829b7832f3292d3786 SHA-1: 3e07c7e11e4a0c83bd82ce35fdfa5a65f3f54663 SHA-256: a816604133a310ad97f8644f772bef868339839a62cfb99d2d3c83286495c2c3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'infrive.ru', which is likely a phishing or malicious redirection site. The PDF structure and embedded content suggest it's part of a phishing campaign, potentially using a lure related to 'Tamilyogi tamil 2019'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/pbw?utm_term=tamilyogi+tamil+2019 PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4416932/normal_60b4306243efe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376852/normal_600eba68f20ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386594/normal_605cd02a2c0f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460954/normal_600a6b3279391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_600f5dff00cf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_602cffb930acc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_6042217f31f6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466154/normal_6065de0851cbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_6052aa1ccfc76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485828/normal_60353f80a4a7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144485823/71442194056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd413c77-ce2a-4c74-a3a5-38370d42c368/73847391035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abac3d84-e30f-4e44-841c-2ae194a996d8/what_does_a_coyote_sound_sound_like.pdfIn PDF document text
    • http://xinunubaz.pbworks.com/w/file/fetch/144927297/3ds_bravely_default_rom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3adc36f-e497-49a7-94dd-89d69ed0d341/scientific_research_proposal_sample.pdfIn PDF document text
    • http://naxenuve.pbworks.com/w/file/fetch/144473520/pofanalejexufefevad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2198c907-5902-428d-9b49-b478e74ba549/sunebamuvikemibeburisuw.pdfIn PDF document text
    • http://givuvop.pbworks.com/w/file/fetch/144926502/vafizemujotap.pdfIn PDF document text
    • http://nutafojijoki.pbworks.com/f/94238385341.pdfIn PDF document text
    • http://xawaren.pbworks.com/w/file/fetch/144963459/andrew_lloyd_webber_cats_movie.pdfIn PDF document text
    • http://sonogari.pbworks.com/w/file/fetch/145083942/71941759087.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/f/is_physical_medicine_rehabilitation_the_same_as_physical_therapy.pdfIn PDF document text
    • http://tuvovazuvezo.pbworks.com/f/ravozoxudekorinizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4e44de-c215-4762-bc21-394aaae99d0e/xejuwuzivekadakopep.pdfIn PDF document text
    • http://vulazojab.pbworks.com/f/ferdi_tayfur_yuvasiz_kuslar_filmini_full_izle.pdfIn PDF document text
    • http://jojekepodef.pbworks.com/w/file/fetch/144905643/saxotojibuxobofiran.pdfIn PDF document text
    • http://xefepexa.pbworks.com/f/download_song_taki_taki_rumba_mr_jatt.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_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 5264 bytes
SHA-256: 10a15837e9a87eb9a483e33ba7c9fc40879ab14ab6d65e21649ee36f01715478
font_01_sfnt_off000116bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BB 10844 bytes
SHA-256: efb23b2534d19949dd88131ec7b2b0512727fc1722bdf406cdfbb4b38fc8943d