Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0dcce1e48764b13…

MALICIOUS

PDF

92.5 KB Created: 2021-02-19 08:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5fb7e2011977f2bed286457b7945ce9a SHA-1: 2627bec995ce52807bfee8de96c41320ce734433 SHA-256: d0dcce1e48764b13319663fd77143783a25639c13d4b4ffb70e52f7266f3b7cf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=how+to+prepare+for+fe+exam+mechanical+engineering PDF link annotation
    • https://wumaviki.weebly.com/uploads/1/3/0/8/130874148/dofojev.pdfIn PDF document text
    • http://guwaxata.iblogger.org/josevosujarezinivege.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/idxgid9/welcome_to_the_future_christian_song.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/cmhhgij/76195474603.pdfIn PDF document text
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/wutosavunujufa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381082/normal_5fc7a849e2cd3.pdfIn PDF document text
    • https://sadavixiji.weebly.com/uploads/1/3/5/3/135333995/9839821.pdfIn PDF document text
    • https://wanalupegekiful.weebly.com/uploads/1/3/4/8/134879682/1497b133e37aa20.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/ribifhd/41800200551.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/tKPLhjw/action_launcher_pixel_edition_plus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456140/normal_5fcfa479bc4d0.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/ghgflQY/free_cross_stitch_rose_patterns_to_print.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jajuzefob.rf.gd/fun_addition_worksheets_for_kindergarten.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 5372 bytes
SHA-256: fcf4d0e1ad2b596e68bb379e7b81bebb5599e842c08484088bbf200a8f6a4e37
font_01_sfnt_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 12780 bytes
SHA-256: ab536095002f2542c819e3deaea6a0d9a4edfb6c91c5d43cc3105ece6e3fcfc7
font_02_sfnt_off00014ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC8 16288 bytes
SHA-256: ec014c159b274f5d1aefa4d076408169a34d4c762d3f2a39573dfcd31f39ceff

Open this report in the interactive analyzer, or submit your own file for analysis.