Malicious PDF — malware analysis report

Static analysis result for SHA-256 14bccd4aac5f3a00…

MALICIOUS

PDF

74.4 KB Created: 2021-04-28 16:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a770678d54a91950ee926ca050067cfb SHA-1: 29672f4a20f7bafe06527ad02fea13ef6809756d SHA-256: 14bccd4aac5f3a00ec1e06456b55ba11d9b5d82b514aa8c0139c10a334b61c8e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL 'https://jottigo.ru/strik?utm_term=ariens+deluxe+28+engine' is a primary indicator of a malicious redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/strik?utm_term=ariens+deluxe+28+engine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5fd82de32dfb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463526/normal_5fdae24f1b574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_5fdb2578d76e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5fd60fd073f7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419633/normal_5fee622e524a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_6040fff3996b7.pdfIn PDF document text
    • http://indonesia2health.online/nenedumezerev6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420612/normal_60207f3c69556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_6026f6d6ecd15.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/j9LCHQv/powerschool_parent_portal_login_page.pdfIn PDF document text
    • https://cdn.sqhk.co/nububufi/gGqFDgd/lawofemudikeveto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375521/normal_5fe24ec2aefcf.pdfIn PDF document text
    • http://glawerry.online/how_to_negotiate_the_best_lease_dealteqbh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_601c5ef554cd5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8be317c1-93d6-4444-9a1c-030c84ae583f.filesusr.com/ugd/709942_60461fdca89a48f79d4da0895f8c6085.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/7523776114.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/hunter_programmable_thermostat_44360_manual.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_00f73a4ad7634b0ea8dd3696ae06772f.pdf?index=trueIn PDF document text
    • https://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_b49529dd9e284e498341a823e3756d80.pdf?index=trueIn 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_off0000e34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 5168 bytes
SHA-256: b2ef4359dd1444432ac2f56a0aeba01bac6f54843192e7285570fce66a90cba1
font_01_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 11224 bytes
SHA-256: 5d68ebca816f3db20280345f88d66982975fadebf676f6d6d22d9e7a83036f1d

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