Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa313995f5be01da…

MALICIOUS

PDF

80.1 KB Created: 2021-02-28 03:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 466979a7b88d100b01b90bb6559885b5 SHA-1: 0d9b555fe349505d58b75ac453105c79cf5a77fe SHA-256: aa313995f5be01dae89b83a99ea1e5a9cb1cac31b4543ffb1e4d71db5dfd46c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though partially corrupted, contains references to 'Gravity Falls' and appears to be a lure. Embedded URLs point to domains that are part of a link farm, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/wix?keyword=gravity+falls+mabel%2527s+guide+to+life PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453906/normal_5fe292894663b.pdfIn PDF document text
    • http://midazimika.iblogger.org/verbal_ability_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470038/normal_602fb505ac7ba.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/bhdmaia/sniper_elite_5_poland_release_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474997/normal_5fe261ff4028f.pdfIn PDF document text
    • http://nuraramibifowom.22web.org/carefusion_vela_ventilator_service_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483335/normal_6020362be6dff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dovijurosovixen.rf.gd/service_desk_operations_manual_template.pdfIn PDF document text
    • http://wajiletum.epizy.com/5542527068.pdfIn PDF document text
    • http://vivimaga.epizy.com/blossoms_of_the_savannah_movie.pdfIn PDF document text
    • http://lelirovosas.epizy.com/10569955926.pdfIn PDF document text
    • http://fusuxitizubuka.epizy.com/best_photo_collage_app_android_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/2200386966.pdfIn PDF document text
    • http://binawojojin.epizy.com/card._io_custom_android.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010aee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10AEE 17424 bytes
SHA-256: c9653259dbb08d0114f99ce901ac8d19654d4b3701f3c1e2b230e66334223c16
font_00_sfnt_off0000d3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BA 5372 bytes
SHA-256: d6f12770fae26e8b5d412c5ccb8e3a3fad95d3ed32813879746d0c87a2a8ba47
font_01_sfnt_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 10692 bytes
SHA-256: 9abf3b14e5c64b31fea4810641f99ea7169b5cae6379aaa0c7e9428fccc164cb
font_03_sfnt_off000124d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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