Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7c3fc28ef7a113…

MALICIOUS

PDF

86.9 KB Created: 2021-03-15 20:14:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ad49ecd21828083365f8a75fd35fee11 SHA-1: 38737679271e2438b89d6033befc2c5fad2cf168 SHA-256: 3e7c3fc28ef7a113a12c3ff9d143bb64c6a2f27f3fc38fb1df17fe9c2873274e
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://jottigo.ru/wix?keyword=water+ridge+bathroom+faucet+manual PDF link annotation
    • http://pirojibanenuzi.getenjoyment.net/treatise_cornelius_cardew.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/93593000820.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426955/normal_5fed13d932e6d.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/cognitive_behavioral_therapy_to_treat_depression.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_5fe6e9b32e3c8.pdfIn PDF document text
    • https://zimatesuti.weebly.com/uploads/1/3/0/8/130873828/529197.pdfIn PDF document text
    • https://xaminipa.weebly.com/uploads/1/3/1/0/131071220/bonixefazusemubinaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466386/normal_6048cf6b38e09.pdfIn PDF document text
    • http://kejurudoji.medianewsonline.com/tomesarofalojezojozama.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec31c18-53c8-422d-aa87-30f5bfd681b0/97505842418.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_6d908f53ee8a4243aa1c2223b6550b2d.pdf?index=trueIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_7808f454fcca4c20950ee9f73df34d1d.pdf?index=trueIn PDF document text
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_131225e327ca4e038ed127e38364f668.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_066c4572e18d4d2daf9fc2e120941ad7.pdf?index=trueIn PDF document text
    • http://kavibajegis.onlinewebshop.net/how_to_remove_delonghi_infuser.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_29a95346faa24f62a81f4908d6fda919.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_df532575d831401bb058332b1e38fb0b.pdf?index=trueIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_6ba9afd2611a4354b2be22c82efa7dde.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f47013-d996-4cf5-af6a-198bf45b53c6/painting_ideas_simple_aesthetic.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_off000111f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F4 5412 bytes
SHA-256: 896a18fc4c2430f19ad606e297a9d1da11e695265f193fa99ee9c0260f24ab23
font_01_sfnt_off00012446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12446 12056 bytes
SHA-256: 945e852c8878d4ed758c7481270db650d16bb3981d36f4b79c773b4ff750fe65

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