Malicious PDF — malware analysis report

Static analysis result for SHA-256 b850a501d16bcc22…

MALICIOUS

PDF

70.4 KB Created: 2021-02-20 14:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 996c50dc3f77ee8fd5161c8e904b2c33 SHA-1: 9203223984b697d57dbf5f6f5be7892958a81d6c SHA-256: b850a501d16bcc22de234a65ba0f473344cffbe55dafab39b1b667c14f885c1c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm designed to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous URLs.

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/wb?keyword=what%20reading%20level%20is%20amelia%20bedelia%20chapter%20books PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483388/normal_60261a26e8124.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/79d83d5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_601ed8711768f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_60181a16b9e15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419849/normal_600d9c724a890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_602890dfbe73a.pdfIn PDF document text
    • http://itasummer.fun/free_printable_flannel_board_stories_templates1mtky.pdfIn PDF document text
    • https://garegijewavib.weebly.com/uploads/1/3/4/3/134389285/sijopupezetod.pdfIn PDF document text
    • http://wildboost.club/best_dog_gate_with_cat_doorvodzm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495385/normal_600fa6ca67c2b.pdfIn PDF document text
    • http://kalulib.iblogger.org/bumodax.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/tibanepoxilibud/nojarokoranuzemem.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/dusovajojavo.pdfIn PDF document text
    • http://babematalal.epizy.com/describing_physical_appearance_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/15718821667.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/kaththi_bgm_isaimini.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_off0000d5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 5764 bytes
SHA-256: 01fc3ba6fcc3f59e361078bc3cce55ecb88af54f432b109ce185fddf3199e801
font_01_sfnt_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 10312 bytes
SHA-256: 05143cfa158b6760cbb37bd9df2a2678a1e5614f848157d861229b49b9a8ec08

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