Malicious PDF — malware analysis report

Static analysis result for SHA-256 18357cefd59612d6…

MALICIOUS

PDF

76.1 KB Created: 2021-04-04 02:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5da081311536f47eb3332f46194e902f SHA-1: b5dd0d470f1c6c5463264a3e10a0d1e8f840af34 SHA-256: 18357cefd59612d6bbe62632bc8aa999241e64242e395f6bc27d9be2358f1ac7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/strik?utm_term=lateral+thinking+questions+quiz PDF link annotation
    • http://fitokapss.xyz/parts_of_speech_notes89577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495257/normal_5fdb2d0fc30be.pdfIn PDF document text
    • http://souve.me/31297728648dj8b1.pdfIn PDF document text
    • http://itdomen.fun/651826169434f87f.pdfIn PDF document text
    • http://mscgis.net/hp_8625_change_inkgg6ws.pdfIn PDF document text
    • http://mitsumoro.ru/15219234835zukqu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_60382fb4e6472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490949/normal_6056c9b413d20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_b84549d3de204a8c9599b6ad03660212.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b83c8f3a-95c3-4540-b7c4-5751200762df/vefuxakob.pdfIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_7d7cf359fd544942afb6e7a43d1dbcee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/memexelu/empty_room_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ceea4e-0f11-40b4-8c34-a49450141522/13046100450.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/greedfall_skill_tree_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c35b9c4f-c90f-41a3-a62e-98430d003cc5/design_of_reinforced_concrete_structures_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/chopin_waltz_c_sharp_minor_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7367f880-bb13-4218-8527-ee00895f50f3/apples_and_oranges_comparison.pdfIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_b1751e2099a248ff860cbbbbf11c852d.pdf?index=trueIn PDF document text
    • https://52cfbdcc-51c1-4e85-ba83-ad74149b4620.filesusr.com/ugd/93d431_d39ffecf4cf74389833cfc957133e942.pdf?index=trueIn PDF document text
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_63479545fec5405bb557e46d15897e7a.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 5128 bytes
SHA-256: 08bd8b80447ef8dc843b621c62cee6ded6022f9cbcb8c812865659121dda86d9
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 10508 bytes
SHA-256: a86b4362199997fece0a85e92d62ba338f3b81f308754060e664924b53b406d2

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