Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf783bb7b36fda1…

MALICIOUS

PDF

82.0 KB Created: 2021-02-06 02:00:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4cac125e1d4095e8237426e94cb71ff9 SHA-1: df188380565accef611882fef18d1135138db2f2 SHA-256: daf783bb7b36fda1cf7533608e27d0974e23d5fc36e45dd64d8230dec9471548
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, with several pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/wb?keyword=western%20australian%20drinking%20water%20guidelines PDF link annotation
    • http://jakor.pro/57557912382ta2te.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5fc5a223d4506.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/jTBW3ii/love_quotes_for_her_from_the_heart.pdfIn PDF document text
    • http://bonus332.site/50935006242pn2m4.pdfIn PDF document text
    • https://cdn.sqhk.co/digiwejasipu/jLhi75C/59973170390.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405420/normal_5fdefd3ecbeb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474997/normal_601dcdd7a23a9.pdfIn PDF document text
    • http://swiss-gear-top.xyz/61331521146c04s9.pdfIn PDF document text
    • http://onlinetyz.xyz/woduwizojeminuxabodepavogpa5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://minizadoku.epizy.com/bifupe.pdfIn PDF document text
    • http://mevelidefa.rf.gd/fodatabotepevitexotajuk.pdfIn PDF document text
    • http://givimuvupavu.epizy.com/23672658653.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/avengers_endgame_ost.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_off00010455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10455 5164 bytes
SHA-256: fcbf27c3050ad8d747ad4cb808875f22c1d6ac2eec34f002d4ee459ee705966d
font_01_sfnt_off00011606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 10812 bytes
SHA-256: 9c48bbd5f501d7a6f506c5e26f1f7a5472d461b744712fb6ffe5abeed7ba3b84

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