Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6102bcb6fce1651…

MALICIOUS

PDF

64.4 KB Created: 2021-01-29 04:28:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c35615b9ec56671e71ad6747ef131d2c SHA-1: 2215d520653d046912a64405aded887d452e3f41 SHA-256: c6102bcb6fce16515ea1221796a892178a7e99d95247e525f0d28ef9cd9db0e1
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 multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to appliance repair and SEO terms, likely as a lure.

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://seumenha.ru/123?utm_term=a+to+z+appliance+repair+macon+mo PDF link annotation
    • http://wavepolabipal.22web.org/aankh_maare_hd_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/hjdcM9V/short_simple_life_quotes_for_tattoos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381302/normal_5fcefa7765670.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wifobujaxude.epizy.com/53233230254.pdfIn PDF document text
    • http://marojinoz.rf.gd/cpu_gpu_bottleneck_spreadsheet.pdfIn PDF document text
    • http://powajokex.rf.gd/south_movie_hd_new_movie.pdfIn PDF document text
    • http://zawumowu.rf.gd/bivunufopetawokaso.pdfIn PDF document text
    • http://faloboxodutak.epizy.com/86879490122.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/hungarian_dance_no._5_sheet_music_guitar.pdfIn PDF document text
    • http://beverotunege.epizy.com/stalker_pro_2_radar_gun_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/scipad_book_2_answers_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/tawimuwovurokatexupina.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/vibration_fixture_design_guidelines.pdfIn PDF document text
    • http://nogurinuzelajer.rf.gd/20716300095.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/acervo_cultural.pdfIn PDF document text
    • http://nepejalaziba.rf.gd/yaseen_sharif_in_english.pdfIn PDF document text
    • http://nunitew.rf.gd/nigulebemuxidepit.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_off0000c04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04B 4940 bytes
SHA-256: 8e09c2d8dd1ac582e4ab633993cad503b00a88d8c695043803ae7a72a884f281
font_01_sfnt_off0000d108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 10404 bytes
SHA-256: 8fc255f9aefb01d5a579763bf8a34f2e3f50e146fce4818bcd7635795089f1b3

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