Malicious PDF — malware analysis report

Static analysis result for SHA-256 023219cc368333e5…

MALICIOUS

PDF

72.8 KB Created: 2021-06-08 23:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 13088b6a5f4fdca3b15b5ba1c4146cf3 SHA-1: 529b74230fb4a9604351ad5c86d826108fe6ee38 SHA-256: 023219cc368333e5d7b029be4a00edd2e4cf4de5041491dab66db52a2c571df4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ClamAV as a phishing trojan. The ML classifier also indicates a high probability of maliciousness. The document body, though partially corrupted, suggests a lure related to 'All the light we cannot see book club questions' which redirects to a suspicious URL, likely for downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://wastran.ru/pbw?utm_term=all+the+light+we+cannot+see+book+club+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390661/normal_5fd633c59161a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_6024581953337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424630/normal_5fca05a1d6abc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414514/normal_6011a7d8cffda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_60265524e161d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144449217/velup.pdfIn PDF document text
    • http://gupiguna.pbworks.com/w/file/fetch/144806229/what_is_a_good_liver_detox_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e6099e-f2d0-4c87-8be1-ce55e55cbf7a/e-bio_worksheet_dna_fingerprinting_answer_key.pdfIn PDF document text
    • http://mopevot.pbworks.com/w/file/fetch/144822447/24306845824.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a07bae-5fc8-4275-94c4-63bbc2bc92ee/goziretusefuvodo.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144417126/download_game_sword_art_online_infinity_moment_english_patch_2.0.pdfIn PDF document text
    • http://zeratuwolima.pbworks.com/f/download_harvest_moon_fomt_bahasa_indonesia_gba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0555b6d3-e492-468d-87ff-33691cfbc7e2/the_boss_baby_season_2_sub_indo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f8b2eda-bbf0-4365-b6d9-e0d1159c346f/the_leftovers_piano_sheet_music.pdfIn PDF document text
    • http://fowobok.pbworks.com/w/file/fetch/144670332/vulufugixudip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f503d70b-504d-4ef7-b060-f7312467db75/buchanan_county_virginia_warrants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f31c73-eb01-416e-962e-95485c6da419/formal_logic_definition_geometry.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/w/file/fetch/144538191/69374430195.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

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_off0000dec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 5376 bytes
SHA-256: c92db659942b19f781fa740ab00a885157f19cf4167eb0c800c4a3b594c48859
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 10692 bytes
SHA-256: df857e17fe2c08715e6825ad130b5a532fee0d03133412d56d54dc26614843f7

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