Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1d465fbcc154b1…

MALICIOUS

PDF

79.8 KB Created: 2021-03-19 04:09:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 615babec136589d843f252f88d99da08 SHA-1: 5dbae20577a7d5335967d770025cf6df39c29cb2 SHA-256: 4d1d465fbcc154b15197c48700d0b4fc0f65c374da93161c9de35d3926a2ed72
186 Risk Score

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 0.9990

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://jottigo.ru/wix?keyword=san+andreas+mod+apk+android+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374198/normal_60505d36d43ae.pdfIn PDF document text
    • http://stankoff.org/57384389718a1yus.pdfIn PDF document text
    • http://prod-fruit.space/zadumogevosezagofufg9i3.pdfIn PDF document text
    • http://termo-nord.tech/sony_a300_camera_errorphsc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_601b0cd3a2b4d.pdfIn PDF document text
    • http://kprovk.xyz/87011994055n8aie.pdfIn PDF document text
    • http://love-your-lips.online/myers_briggs_personality_types_rare5ctl3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_601c6bc404700.pdfIn PDF document text
    • http://crispyset.online/15119239212ahw5o.pdfIn PDF document text
    • http://8bitbeardsco.com/puzzle_quest_2_assassin_guidekph1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381748/normal_5ff7974cce5d7.pdfIn PDF document text
    • http://albl.ru/restore_vcf_file_androiddsobg.pdfIn PDF document text
    • http://pixell.store/hamster_meme_template6x196.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f61dd91-ea7e-4edc-a837-c43fae5dccfb.filesusr.com/ugd/ed897c_970be6e8e99a4ec8a303823bdc5c0df1.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_a6b9f7c487c74f829b239a8ecf091244.pdf?index=trueIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_b6024df83e0a437a80046ff7be495c41.pdf?index=trueIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_8e4681f767c6499588a68916568f14ee.pdf?index=trueIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_bb3ae5c6f56644efa233c705fc141e84.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_18f84cc3e901467588fc418f094e9ded.pdf?index=trueIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_11ee3dc18f184f90b3cb576d7b438432.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_7cef8d3a03a24159a2a63d31854e2a2d.pdf?index=trueIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_9ea986f69c084c21ac2a1c19278df19c.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_db162c76f925493a808f8396d59f8cb9.pdf?index=trueIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_95bcfd752605488294e2fb51bcb25598.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_4687dace96c14b3aaeabf3f9908a1651.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_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 5292 bytes
SHA-256: 7d32b050e8190c8845aa1a14af8e09dedd70e31ecdcb48e5baf7eba16a738a2e
font_01_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 10808 bytes
SHA-256: 3c139df443b711a6c81add71c4150f41a9100faed785c98dbbc1f6a7dfcfd318