Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6b75f17014db94…

MALICIOUS

PDF

82.4 KB Created: 2021-04-17 14:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fba810eea83d28eea4e627dc980e9b8f SHA-1: 91c1e9a019a7195512cc0fc7e302aed2045b8420 SHA-256: 3a6b75f17014db94b8c238e4477a34d5c391b9817aef6d50963c338a2180b572
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, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or redirection to malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://lozipotod.ru/strik?utm_term=survival+food+kits+near+me PDF link annotation
    • https://cdn.sqhk.co/liritefebat/ohep8hd/95217262481.pdfIn PDF document text
    • http://zimarul.iblogger.org/apx_6000xe_spec_sheet.pdfIn PDF document text
    • https://jesofoxera.weebly.com/uploads/1/3/1/4/131407857/nuvevo.pdfIn PDF document text
    • https://mefifusefom.weebly.com/uploads/1/3/4/2/134266023/c5e58.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/Efhhjea/puwadasovajesazuz.pdfIn PDF document text
    • https://wajabanafeku.weebly.com/uploads/1/3/4/5/134599300/9691946.pdfIn PDF document text
    • https://cdn.sqhk.co/pixefavenar/iihaEgd/lezanugemezadexawulife.pdfIn PDF document text
    • https://cdn.sqhk.co/wukatigubo/hhsjijb/mazukozuxu.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/4791399.pdfIn PDF document text
    • https://cdn.sqhk.co/lidesoxu/hhihAgj/mariage_d_amour_partitura_para_piano.pdfIn PDF document text
    • http://juvasojiwal.66ghz.com/is_adobe_premiere_rush_free_on_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/dulunukosep/apPhfih/81662006777.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/df59a1c1-fa9c-4f4e-9125-433198e3bc0e/is_11_23_63_on_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/basic_english_speaking_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d2c926-1b09-4907-965c-aa413b6eaca5/which_brand_of_robot_vacuum_is_the_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8598a6d-07bf-46c5-8286-c17bfd2e61ab/msi_990fxa_gaming_motherboard_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/tabene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f824449f-8b8d-42ec-bc3e-be0b3486fd00/gopro_hero_3_black_manual_cz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6499232-eb14-425f-9f59-f2c6c19867ea/juzojejivekobexulaxixepe.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_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 5164 bytes
SHA-256: 79f8acbfe2eccb7fce5b97d4f27ced93541c140d341800f1e700988f163be682
font_01_sfnt_off000109bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 10604 bytes
SHA-256: 0c786745803cae10e93cbc8b29540bcd2f7583d45cf6d4e05843ea89094078eb
font_02_sfnt_off00012dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c