Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fea35d4933f2b0…

MALICIOUS

PDF

78.4 KB Created: 2021-03-23 12:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 05dbc7e396be4fef6ece559492b2666d SHA-1: 90f77e7b10a680eb308e8f0a431dcceb2c878f1b SHA-256: 10fea35d4933f2b0e074879a7e1383f835b7f6ecb72d2688c1c35a5780c8dc93
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://resalured.ru/wix?keyword=stained+glass+window+project+geometry+answers PDF link annotation
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/210b9869f.pdfIn PDF document text
    • https://cdn.sqhk.co/fixosotefe/c0jhieC/dance_flexibility_workout.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/jigc8FW/barrett-_jackson_cars_for_sale_2019.pdfIn PDF document text
    • http://bizegusesugusus.iblogger.org/amsterdam_sightseeing_map.pdfIn PDF document text
    • https://gagakulusete.weebly.com/uploads/1/3/5/3/135326625/6023865.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/PjPgcA9/when_does_international_soccer_season_start.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/erjcjg1/wawubinewuminunipekade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juvisupejigu.epizy.com/learners_test_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/072f6378-478b-4cf0-bec5-902d151c9104/pudelex.pdfIn PDF document text
    • http://pulilidason.epizy.com/62659956100.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/pijijot.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/matavobawakosukor.pdfIn PDF document text
    • http://kijijagasakum.rf.gd/tosesotogilanav.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/the_moon_is_a_harsh_mistress_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc359a7-c428-4537-982e-78b9131481b6/28970648367.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_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 5768 bytes
SHA-256: 4e022a8ca2f10fa499659964d5ba88ecb7dc4b4176be8757b5939b5bfb9f3518
font_01_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 10972 bytes
SHA-256: 39f974c9784f278b28b94b7fe8c7c48340487760ef0ac469c92f8602d4ef71d6

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