Malicious PDF — malware analysis report

Static analysis result for SHA-256 86511d97227ae46a…

MALICIOUS

PDF

77.8 KB Created: 2021-04-02 10:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0cfa080e403f50829d8d1c7bdb517864 SHA-1: 56b4a9756d23f6d95fef406a19fad739bdd7fd1e SHA-256: 86511d97227ae46aa4fad071b8483f91ac74f9b7174dce825a46a404abd6a295
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/award?keyword=trends+shaping+education+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379034/normal_60103a00e4633.pdfIn PDF document text
    • https://diwopoko.weebly.com/uploads/1/3/4/5/134597367/xoletefez-betumedapi-murixevid-bexoviwogaxekib.pdfIn PDF document text
    • https://moxudoged.weebly.com/uploads/1/3/3/9/133999753/larugerofe_babekokin.pdfIn PDF document text
    • https://jewezuwexokuj.weebly.com/uploads/1/3/4/7/134717424/9334797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_60203461520af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_603303737c1af.pdfIn PDF document text
    • http://sesalon.xyz/algorithms_illuminated_part_1_by_tim_roughgardenxhaa8.pdfIn PDF document text
    • http://prosale.company/frosty_the_snowman_2004a0233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381971/normal_605ccc30d4562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_6030536f88a76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e91ec88f-78a3-4513-9122-96f2ef83e40d/mechanical_design_analysis_engineer_jobs_in_pune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d6a9971-e8bd-4aa6-be9c-55c25826a81a/how_to_start_my_ryobi_pressure_washer_carburetor.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_cc299f0a131f44cf967ab7597ff011e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b6a8105-94c9-4ed0-9e2e-0d6ade6a1e9e/gepideva.pdfIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_e5a6751cf4ca4b8c95821b0119bae237.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 5216 bytes
SHA-256: 45b6e23a338c8fc7ecc64bc7a80372d71c46a339df90f68f05b8af742419f397
font_01_sfnt_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 10412 bytes
SHA-256: 95ec293a4954279a9e502c5cec11d31093f77d3596585f397ea7b1c7da00ae95
font_02_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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