Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fb41b0eea1dcc2…

MALICIOUS

PDF

67.2 KB Created: 2021-02-19 07:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0eb9129f206a6c121767fe02cd90ee6e SHA-1: 9f331ea3007fc09bf02af06836601b647ced88c7 SHA-256: 25fb41b0eea1dcc282b5a80eef0cb27f63e1d18fcf762e5b2eb9232d474c388e
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://maypoin.ru/wix?keyword=lightning+elemental+pathfinder PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481059/normal_5fed284849cdb.pdfIn PDF document text
    • https://mitabepomumo.weebly.com/uploads/1/3/1/8/131872015/2716425.pdfIn PDF document text
    • https://ruvatekokero.weebly.com/uploads/1/3/1/4/131437102/4264002.pdfIn PDF document text
    • https://dipakiwafopij.weebly.com/uploads/1/3/0/7/130740044/91367.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/the_interplay_between_exploration_and_exploitation6l99y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_602ee360c0b12.pdfIn PDF document text
    • https://fevupadijedip.weebly.com/uploads/1/3/1/4/131407665/fujobeviduwowanuvig.pdfIn PDF document text
    • http://copyrightnotices-form.com/concrete_retaining_wall_design_spreadsheetg9dmg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455883/normal_602e990373a8a.pdfIn PDF document text
    • http://vkysnaya-eda.site/tolijobudi44m2o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470226/normal_601c9c74af619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_602055cc45cd7.pdfIn PDF document text
    • http://tekcabinets.xyz/lukolipesdb1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/osrs_bandos_bossing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/76606272606.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/and_install_apache_tomcat_for_eclipse.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_off0000cb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB28 5216 bytes
SHA-256: 1bc61ba13ad90502e0ef0aeee73f19a7aece6e77ff64c274966e459bb56d544d
font_01_sfnt_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 10356 bytes
SHA-256: d9608128b90eab4716091c4c8850fee8b36cf2cb7d393b3a4c5586ed32ba7a30

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