Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f73b28b374b4ef8…

MALICIOUS

PDF

74.7 KB Created: 2021-06-08 19:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 620aea92c2f39d25f516d2e6d547b488 SHA-1: 2538fd349510bdedb12b6b583c46cf7447286039 SHA-256: 6f73b28b374b4ef81979d5981cea150c995be383cda672b645357a66ea13e236
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 5

  • 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 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/123?utm_term=informe+psicologico+en+ingles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445868/normal_60b7b94185018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413228/normal_6061950a93e7b.pdfIn PDF document text
    • https://tebugusenaj.weebly.com/uploads/1/3/4/8/134870623/toxuxumozawabikokovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_600d962b1e525.pdfIn PDF document text
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/tonerofivoxurifodi.pdfIn PDF document text
    • https://fokorakadugapo.weebly.com/uploads/1/3/4/4/134444193/fd2ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479932/normal_6006afd1f0c01.pdfIn PDF document text
    • https://dujibirarikow.weebly.com/uploads/1/3/4/3/134321406/nuzejisifu_zoralenunikad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_6058b401da074.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403259/normal_5fde9c052873d.pdfIn PDF document text
    • https://bewotenugajuvu.weebly.com/uploads/1/3/2/6/132695730/41e9450a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bomasasawavi.pbworks.com/f/jilape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb72321-4e50-4e32-ab96-7d17fbb273c5/what_are_the_different_types_of_reading_techniques.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/saps_psychometric_test_2020_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5868780-172b-4a02-adab-907b6bfd2021/pofewijojunavotojusifim.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144447183/best_tune_for_2005_subaru_impreza_wrx_sti_forza_horizon_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17612c71-2dd6-4689-ba4f-c8abed1dc030/66464943948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cfaf2da-d36d-4c3a-b180-ad5bcd789033/100_deadly_skills_book_2.pdfIn PDF document text
    • http://zipiwume.pbworks.com/w/file/fetch/144607866/21285516645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d83df0-e749-4bfe-aef6-c76f2823fd37/kenmore_70_series_gas_dryer_troubleshooting_no_heat.pdfIn PDF document text
    • http://safubudesowi.pbworks.com/f/30491456449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4268b465-d0da-4fa6-b954-7d6fe219387d/mummys_mask_players_guide.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_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 5064 bytes
SHA-256: f59c84d96c036f0b73936d839988c38b3198664ed2bf6dbaad131d5de49f3317
font_01_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 11180 bytes
SHA-256: ebee26e4110e4b0605d1df97750c4b41c978a5bf3fc90745993e62d5302aff42

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