Malicious PDF — malware analysis report

Static analysis result for SHA-256 1041ade6aa8d91ad…

MALICIOUS

PDF

84.5 KB Created: 2021-02-14 17:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ae9850ccd99170449b6ee86493e5b947 SHA-1: e8759399ee8e7dffcdc0a2eb670f41b4b52a5335 SHA-256: 1041ade6aa8d91adeaa98101f5fd24053e6b63a52b5f4001344925f1374e27c1
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=bunn+coffee+maker+water+line+adapter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421767/normal_6006ab0a8374d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483336/normal_5fede80907f5c.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/bhWgjie/marble_music_machine_vimeo.pdfIn PDF document text
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/gelerinudi.pdfIn PDF document text
    • http://gouliwer.online/83884924063fggbn.pdfIn PDF document text
    • http://studytogether.fun/herons_circle_reno_nva9xtd.pdfIn PDF document text
    • http://vinorama.fun/avast_antivirus_pro_mod_apke8ohn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_600fc41d301e5.pdfIn PDF document text
    • http://tb-films.ru/sol._du._ac._in_marksheet_2013ygtlh.pdfIn PDF document text
    • http://walkover.me/35917166188m7ggk.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/1062729.pdfIn PDF document text
    • http://all-system7.xyz/podijanemenefalinolamenggl6q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386621/normal_5ff58f7d1b413.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/dDidym5/winkbed_plus_vs_saatva_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460457/normal_60198be37798f.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/2d_shapes_worksheets_grade_576i1k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 5208 bytes
SHA-256: 057fed0e1b4ac85ba47052f1fdecbcb4ae21c4abcaabe12c21dffea439603180
font_01_sfnt_off00011314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11314 10472 bytes
SHA-256: 52c62ed44b4abea01525d5bead650b7304aeeeee617343ce75a82d0558528b3b
font_02_sfnt_off000136e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E2 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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