Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a13e3d8441913aa…

MALICIOUS

PDF

76.0 KB Created: 2021-03-17 22:38:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdc0f0d36dda0f339022a7ed01b452e1 SHA-1: 2bf0177e078c63a608e320c1731e261230769a4d SHA-256: 5a13e3d8441913aaede73924d9be727d433579c3f3be79bb9bc253758900996f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farms to manipulate search engine rankings or to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/aws?utm_term=kenneth+cole+watch+bands+brown
    • http://mamefumiwuto.mywebcommunity.org/10063475533.pdf
    • http://namixojebeku.iblogger.org/qcy_t11_review.pdf
    • http://lirinevewafa.mypressonline.com/jijixurelore.pdf
    • http://wotukujis.sportsontheweb.net/6100972237.pdf
    • http://dapobapi.22web.org/what_are_living_things_composed_of.pdf
    • http://fofiwafajelerax.sportsontheweb.net/what_are_the_elements_of_a_short_story_describe_each.pdf
    • http://walapakawoxu.22web.org/18967159173.pdf
    • http://turekawetareju.iblogger.org/greek_and_roman_theatre_similarities.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sukokovevaz.atwebpages.com/fomoxinomomijefe.pdf
    • http://jabejanaboz.atwebpages.com/ukulele_songbook.pdf
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_7794415363b74523965cb728e3925c66.pdf?index=true
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_b300c4e8ef5646f8aa8eb06be36f3255.pdf?index=true
    • http://tezitap.rf.gd/rogutaberuvag.pdf
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_3ee70bae9e714462a631d3167547c86d.pdf?index=true
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_d0f3ce668caf46ba9ec02c13581f4b0a.pdf?index=true
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_cc98951d80e2416f99e87f18400a3cfe.pdf?index=true
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_f3a634fcfa3b4bf88d0ce3d39bfbc445.pdf?index=true
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_a9d3718574364c05a26236090a6f9d5c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd7.bin
569a4dae03af39b9c74c58d61e3a76b36ec4d5d365adf1d653b3fa1b90d1fb96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 5228 bytes
font_01_sfnt_off0000feaa.bin
58fdcbd13e427aade679181a0a2c1884951053c690b194f7c3bfb55b852d0672		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 10704 bytes

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