Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d85a01c59a3fe6…

MALICIOUS

PDF

77.2 KB Created: 2021-05-18 14:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 13b2b5b0a45d8be773284ef3b51c5fcd SHA-1: 70a233ab8905880ecffdcc29b8ef33fb46ea0d77 SHA-256: 90d85a01c59a3fe66f618dbdb16f1deafa2c4fedcc3f7250f4c107a342a15404
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://jacksth.ru/strik?utm_term=solid+state+physics+by+s+o+pillai+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486997/normal_603df5eb1d63a.pdfIn PDF document text
    • https://vobawele.weebly.com/uploads/1/3/5/3/135334277/momatis.pdfIn PDF document text
    • https://fujulisu.weebly.com/uploads/1/3/4/0/134042697/0f4172a0903.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459482/normal_5fc620baf188d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488572/normal_5ffddff9f2320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474206/normal_601d12de54be7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423442/normal_6065961a89037.pdfIn PDF document text
    • https://netebina.weebly.com/uploads/1/3/4/5/134596662/0c0c91d993251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443610/normal_5fef5a918fd5a.pdfIn PDF document text
    • https://kunejadisitezan.weebly.com/uploads/1/3/4/0/134096254/415aba1776.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/4f2e59dc-b4d7-4e3d-b900-f8a2a16424e5/61284374595.pdfIn PDF document text
    • http://nuvujudidasutem.rf.gd/boxodisomojipibumato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/942c544e-de71-4feb-97e6-c07e499e5906/where_can_i_throw_away_my_washer_and_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d61c7d1e-cb1a-4041-a037-94ce254071d5/54539541242.pdfIn PDF document text
    • http://dolifusekaxug.epizy.com/rifekobebemufetuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed07a0c8-543d-4355-8d6d-cab6291a0cd5/cards_against_humanity_funny_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5fc3489-8a30-4dc9-b531-c01a2b42b175/46193510510.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/gafetes_para_nios.pdfIn PDF document text
    • http://likifodafiduno.epizy.com/35250073718.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/45549842790.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_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 5680 bytes
SHA-256: f9442b33c4c446fa765aaad8c78b0e01de190e2c21055d1c01386090a61e70cd
font_01_sfnt_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 10244 bytes
SHA-256: 75dfe711481fc659720f9c0face02ed8a9fd92379434ae7c290fd8aa65d49d27

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