Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b62a25eec608e9d…

MALICIOUS

PDF

80.6 KB Created: 2021-03-13 16:01:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0778163a5ca7b0b1d135cb8d2012b9b0 SHA-1: d4fa33bb309cb174ed2c1a651a10456c1ceb8670 SHA-256: 9b62a25eec608e9db8e281df1aafbcaeefc4983830b1e1cb39e832ca06331033
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to disposable hosting domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The primary purpose appears to be directing users to a large number of external PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soxebez.ru/123?utm_term=infectious+disease+news+reports PDF link annotation
    • http://xevoxisukima.22web.org/7287468959.pdfIn PDF document text
    • https://bewotababuruga.weebly.com/uploads/1/3/1/1/131163836/rixapagexod_dufufajuwe.pdfIn PDF document text
    • http://legko.travel/white_old_skool_vans_with_black_line4c0t7.pdfIn PDF document text
    • http://ufenmac.com/1518569894hwq74.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/2008_jeep_wrangler.pdfIn PDF document text
    • http://zaxobus.iblogger.org/science_crossword_puzzles_answer_key.pdfIn PDF document text
    • http://kamefutebiwef.mywebcommunity.org/24605061118.pdfIn PDF document text
    • https://jisetufazuv.weebly.com/uploads/1/3/5/3/135307323/wukukob-tirin.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/tefibomera55sbp.pdfIn PDF document text
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/rugigan.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/lokatem.pdfIn PDF document text
    • http://dapovevi.mywebcommunity.org/magikosutewimonevanez.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ebbad6f-2ccf-4f0d-95ce-512ebcff3d64/linksys_e1500_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2471009b-aef9-4efa-aaee-ac692a37f11a/niwidujidikezubolorupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd532b5-3ada-4c37-b7eb-1f75b8aea5f9/batilepibugasomew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef8c1fe-9f7d-4956-b957-68dd2317b191/tadusuwuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29a44c9-8a36-4920-babe-25f2ab27d403/gifafizebojugusel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9aa2711-6a36-4ca9-9e96-ccec3156c0b4/72678197678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f2685b-3554-4751-a02a-e47171a00591/abre_las_puertas_del_cielo_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8acd3eea-b5d8-4331-937a-eb676babeac7/79992741275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd54eb30-4ac0-4043-929d-46d05e4e9e36/percy_jackson_the_lightning_thief_chapter_14_questions.pdfIn PDF document text
    • http://bebojivim.myartsonline.com/dialectical_behavior_therapy_skills_workbook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 1612 bytes
SHA-256: 29b9bb2bdb42290be4cbdd97a5baa314b4b7cb2ffe85cc5719b68dba54b975a1
font_01_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 5148 bytes
SHA-256: 4886a8de686bd10d2d53ea56c4012efc242df171d2a20ca0dd9ba14c6fe8785f
font_02_sfnt_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 10576 bytes
SHA-256: 1d9f33d7b06753409ccdcb16ef4a24cacd240948779edf13a5f5d140d33048c2