Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac7359b2501fc4d…

MALICIOUS

PDF

77.0 KB Created: 2021-04-11 02:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 16d8d0b65d959728e2de4ae55d7f929e SHA-1: 97c8d6d10a8ed60fa011e8e0c14d096227ea9bef SHA-256: 5ac7359b2501fc4d6bfd514736f7b8915419ccdbb879c26012cf7240c2c82658
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, many pointing to disposable domains, indicative of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

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://druttle.ru/strik?utm_term=what+does+the+tub+clean+cycle+on+a+lg+washer PDF link annotation
    • https://cdn.sqhk.co/zimopaji/aqBNbEg/daxabujodalanarufofir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453334/normal_60699862ba199.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402488/normal_5ff69ee99a39c.pdfIn PDF document text
    • http://fafaviga.iblogger.org/fact_sheet_meaning_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/kakovavop/aih3Ann/4514105213.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/iJr0ljc/5112486273.pdfIn PDF document text
    • http://ligapofajami.iblogger.org/adobe_lightroom_tutorials_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375525/normal_601bfd0ba25ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_600c6429b20c2.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/ijgcsHM/wukelojokuwunizubi.pdfIn PDF document text
    • http://pirikulifiwitif.iblogger.org/alex_rider_television_programme_season_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402252/normal_60215c01e27a8.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/q5hgAig/adidas_nmd_r1_black_and_purple.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_55e903b7795a464286b53f173ecfdf4a.pdf?index=trueIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_749c911f6aa740589decd1da5c7e1676.pdf?index=trueIn PDF document text
    • http://zuzenif.rf.gd/download_cameroon_history.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_090aa1dd3000487e94ac8bc2ea9e83e2.pdf?index=trueIn PDF document text
    • https://ebd157e6-94c3-4ff5-b3ab-516f87acbde6.filesusr.com/ugd/e87473_bba7010f8d2843e398219fb5cd05924f.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_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 5548 bytes
SHA-256: aab2a91664c423d4302ff47dafa662b89b263981a6d9a0c4e10c252985c07962
font_01_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 11188 bytes
SHA-256: a9dcc2844359caabb5c52cc99db20a7b68eb25729e71e38b9225543648c2432a

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