Malicious PDF — malware analysis report

Static analysis result for SHA-256 af417cc77700d7bd…

MALICIOUS

PDF

81.0 KB Created: 2021-06-02 20:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 807bcec427152018849f44317f7d0c11 SHA-1: daa2f7624630d24329894031d5848ae4a36f865a SHA-256: af417cc77700d7bd66a5843dc40f84be1864245ea5f4a39ec24e88e4ee6a0de8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://garglob.ru/pbw?utm_term=case+in+point+9+complete+case+interview+preparation+pdf PDF link annotation
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/0e36e3a64b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_606a9c05ea016.pdfIn PDF document text
    • https://makaxifosezopuv.weebly.com/uploads/1/3/4/5/134511124/mepenarefare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482426/normal_5ff962a9c4e99.pdfIn PDF document text
    • https://rigopijifotifat.weebly.com/uploads/1/3/2/6/132695828/rafobur_xuzofabimem_jujar_pisilazag.pdfIn PDF document text
    • https://kinokisavejobet.weebly.com/uploads/1/3/7/5/137513499/b7edf22b7f1a3e.pdfIn PDF document text
    • https://tajonerimokop.weebly.com/uploads/1/3/4/8/134879789/0f56a125243f205.pdfIn PDF document text
    • https://jajufuwupu.weebly.com/uploads/1/3/1/1/131163717/nuzubiguke.pdfIn PDF document text
    • https://lovuvolix.weebly.com/uploads/1/3/4/8/134866108/841e2b2713697.pdfIn PDF document text
    • https://javesobasi.weebly.com/uploads/1/3/4/7/134736097/60c3a6b513.pdfIn PDF document text
    • https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/2503166.pdfIn PDF document text
    • https://doxeraja.weebly.com/uploads/1/3/1/8/131871607/wugijugelalagujonit.pdfIn 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/868dd189-30ee-4acf-afe0-4c40ca08a03f/keurig_k10_mini_disassembly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eccf45e9-274b-4925-b2b2-b3c7529007fa/cinnamon_roll_premier_protein_shake_costco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8126459f-77d4-4524-9368-367068c152ba/mole_concept_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a6baf34-3634-4b46-9aa3-a66feb05e329/como_cambiar_de_a_word_sin_programas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/944c10d2-47d8-400d-b501-f3976fe3559d/78669041543.pdfIn PDF document text
    • http://xujefix.pbworks.com/w/file/fetch/144422934/dosejajamutebatir.pdfIn PDF document text
    • http://kekirow.pbworks.com/f/does_sauna_belts_really_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a88c0b0-f6ac-44dc-bb08-aa323b6d0f1d/determining_the_molar_volume_of_a_gas_lab_chem_fax_answers.pdfIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144461685/vipijafiwetepadow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ef057d-6c70-4c9f-aaf7-0aa8b4c3d0b9/the_latest_g_shock_watch.pdfIn PDF document text
    • http://kinuwibe.pbworks.com/w/file/fetch/144453489/lekowemopafuwodiwofexal.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/w/file/fetch/144413796/80242083762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3a70f6-5198-4e4d-8687-b019db246f04/diwulafu.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_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 5512 bytes
SHA-256: aa224658a558ca14f638e1b32c23de601ed7fab45ea9c93ce7293158dffcb62c
font_01_sfnt_off0001132d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 10196 bytes
SHA-256: 4e9f1382d21a5e1a6d3eb5b36f7d038f8f85f517254e435b095e7bc7238bd5bc