Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d97aa6f3297a6b8…

MALICIOUS

PDF

67.7 KB Created: 2021-02-23 15:59:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c18f63849cdd0a36834b8ef23c59c2d9 SHA-1: 6ecb2f1dd8165148d6dc8d84b480a2cee682af29 SHA-256: 3d97aa6f3297a6b8a6119bbbbb9d3c0ed16dfc22ab8bd9b90f6666abf2dd89b5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains or services like Weebly and Epizy, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/strik?utm_term=description+of+secnav+manual+5210.1 PDF link annotation
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/nikozitato.pdfIn PDF document text
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/bukutujuperag.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/matchbook_collectors_price_guidezaiof.pdfIn PDF document text
    • https://zumofadun.weebly.com/uploads/1/3/4/0/134042547/315048.pdfIn PDF document text
    • http://zuvilivupeke.iblogger.org/chaar_sahibzaade_mp4_video.pdfIn PDF document text
    • https://bozadabeduli.weebly.com/uploads/1/3/4/8/134869561/541b206a1bfc76.pdfIn PDF document text
    • http://tozokexijuxizis.iblogger.org/10939972303.pdfIn PDF document text
    • http://fitokapss.xyz/545974889922dz6o.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/1992_instructional_fair_inc_worksheets7q46a.pdfIn PDF document text
    • https://dagatalodizutod.weebly.com/uploads/1/3/4/8/134883817/1614227.pdfIn PDF document text
    • http://xuponigivixi.66ghz.com/bhangi_video_song.pdfIn PDF document text
    • http://fevozogu.iblogger.org/90081743809.pdfIn PDF document text
    • http://lanufutado.22web.org/good_character_traits_list.pdfIn PDF document text
    • https://bitipares.weebly.com/uploads/1/3/1/3/131379103/625444f6c2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pigolo/81490717470.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/97714169615.pdfIn PDF document text
    • http://silimevi.epizy.com/detroit_become_human_pc_full.pdfIn PDF document text
    • http://pemukusa.epizy.com/dmso_sds_sheet.pdfIn PDF document text
    • http://tusajemepo.epizy.com/lego_boost_robot_manual.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_off0000cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7D 5704 bytes
SHA-256: e7f5f66258af7860bfb2ec129f63ed246c1946980754e2720e144272a8f4b2a8
font_01_sfnt_off0000def5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 10196 bytes
SHA-256: 2069c7df9f8fc17861f4184dec310982daad3cd90b587845e28af3d08515430d

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