Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a12602c007efdad…

MALICIOUS

PDF

101.3 KB Created: 2021-03-20 08:06:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 957e59501e19faddaae571e2132b5801 SHA-1: b44a24664b425614ecba09242c7f385c6639bc86 SHA-256: 2a12602c007efdad14b06335dad1b63dc942ac001e9c4f2ece19750bbb6b3ce0
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to disposable domains and are likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Heidelbergcement annual report 2007' and 'wkhtmltopdf', suggesting a lure to disguise malicious links.

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://mezovuduw.ru/123?utm_term=heidelbergcement+annual+report+2007 PDF link annotation
    • https://cdn.sqhk.co/popuzanuguw/0Dhejft/80_s_quiz_game_level_201.pdfIn PDF document text
    • http://reduslim-eu.site/39592994487oct9k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_60392f5bea69f.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/JFhbhtO/bhojpuri_movie_hd_video_song.pdfIn PDF document text
    • https://cdn.sqhk.co/firumefetev/Oifidgi/54125661533.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzudulo/0E0hjEc/47421526269.pdfIn PDF document text
    • http://ejinaya.com/what_is_afge_unionkrg8u.pdfIn PDF document text
    • http://alkim.xyz/portent_of_disastercidha.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_604a81547f18b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_6041469bbb4a5.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/5eo67ij/my_child_is_growing_up_so_fast.pdfIn PDF document text
    • http://usene.xyz/mobiwekolivalafufulamakhw75.pdfIn PDF document text
    • http://reduslimitalia.site/how_to_start_a_music_streaming_serviceuw94d.pdfIn PDF document text
    • http://50offstore.pro/58082653057j0066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_6042c191761c6.pdfIn PDF document text
    • http://opros.xyz/ar_600-70_army_writing_programp8sey.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxuramubot.epizy.com/32965852623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1614c1e7-c59f-4b90-a082-ae5780c95836/what_does_overall_text_structure_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d879d82c-bb76-4c53-ba37-3d44eac71399/50975661115.pdfIn PDF document text
    • http://rovalonawu.epizy.com/guided_reading_level_brown_girl_dreaming.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_off00014ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA4 5672 bytes
SHA-256: 051170612eeee1a08554778f93e4430a1baf0c14df63011f7b4b99e8d52d3d9a
font_01_sfnt_off000161d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D8 11108 bytes
SHA-256: 123dafa813ac2ee4ddf54c47870f460dfc45e0630aeee32077cf883a1d1bf17a

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