Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d38a85ff9902dcd…

MALICIOUS

PDF

71.5 KB Created: 2021-03-28 15:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 82c4a80e82bf64d2d69930b3b901f283 SHA-1: ddd67e4aa7f85bbaa4fd9a8f8049f5b40fa65083 SHA-256: 3d38a85ff9902dcd208601520308aa84152bdcca820b616be79b83c4325b67e6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, many pointing to disposable domains, indicative of a link farm or SEO manipulation scheme. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest a potential for redirecting users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/wix?keyword=asoka+dbq+answer+key PDF link annotation
    • https://cdn.sqhk.co/pazaxefuma/ficjfjh/84325204586.pdfIn PDF document text
    • http://internet-babki.ru/how_to_turn_on_blue_light_on_switch_pro_controller076x6.pdfIn PDF document text
    • http://hamlikjorettoop.ru/how_to_change_wifi_on_sky_q_boxsca21.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/sofejumaze.pdfIn PDF document text
    • https://cdn.sqhk.co/tamikoveken/hgagdkR/business_dictionary_online_english_arabic.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/migax_jeroxawemojum.pdfIn PDF document text
    • http://gladkoe-telo.xyz/wuluzampxxhj.pdfIn PDF document text
    • https://cdn.sqhk.co/kukusagufo/luWkukN/espers_ff12_guide.pdfIn PDF document text
    • https://wizujepubenepax.weebly.com/uploads/1/3/5/3/135317151/mubidujagawasu.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/jkClhcR/59140901095.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/jaie7jg/grandparents_day_ideas_for_nursing_homes.pdfIn PDF document text
    • http://shop-onlain.fun/electronic_structure_of_matterbe65v.pdfIn PDF document text
    • https://cdn.sqhk.co/rebabafa/Opjanhc/tojoxebiduboxaxiwaxepeveb.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/pujaxeza.pdfIn PDF document text
    • http://vigastlens.xyz/72314721681ghuvu.pdfIn PDF document text
    • http://finansi-7.online/graco_snugride_30_infant_car_seat_recalloqd0x.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/72hbkim/llama_pinata_cake_topper.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/43568115300v7vcn.pdfIn PDF document text
    • https://cdn.sqhk.co/rivinodati/Pjfdbic/97301834237.pdfIn PDF document text
    • http://5dradio.ru/42445412823gwthe.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/fadobirak/death_of_the_author_lindsay_ellis.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/zumogipikewuwowo.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/aditya_birla_health_insurance_claim_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/free_after_effects_kinetic_typography_templates.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_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 5300 bytes
SHA-256: ebd25f1d90a1cc316105ff91b9fda41f3d0a4d4dc441438362fd386e7fde663d
font_01_sfnt_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 11056 bytes
SHA-256: 7213f3e070d7cbff4ae09b8a67339665992db5bfdc863124ad9acf969c4941cd