Malicious PDF — malware analysis report

Static analysis result for SHA-256 810694222f9c6a6c…

MALICIOUS

PDF

76.6 KB Created: 2021-02-15 09:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b923dfefad80ddd6e21e28b5f9d42905 SHA-1: 23c6adfb561d20e78d5d5e2a0c573000f98bad6a SHA-256: 810694222f9c6a6c674b6728b86dbf0027801581a2dd778bf224166fb46e9f65
134 Risk Score

Malware Insights

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

The PDF document contains multiple external links, with one specifically pointing to a 'grindr mod apk 2018' download, suggesting a lure for potentially malicious software. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wix?keyword=grindr+mod+apk+2018 PDF link annotation
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/jopugukus-defojunow-pubironiladote-xibunimosesevu.pdfIn PDF document text
    • http://mnogoturov.com/55501239476r6xcb.pdfIn PDF document text
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/9446672.pdfIn PDF document text
    • http://cancandance.org/luriloyi7rp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453730/normal_6001f5ff4a72c.pdfIn PDF document text
    • https://lufegema.weebly.com/uploads/1/3/4/1/134132410/torovitedevu.pdfIn PDF document text
    • http://dvestideyli.xyz/fuwobewafijefemuwprvg1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5fe9b7813a680.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/vekodupiwarobi/moxover.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/pewter_report_cover_3.pdfIn PDF document text
    • http://boribasumagit.epizy.com/product_costing_template_excel.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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 5512 bytes
SHA-256: 07b300d2ca3975be61bda1f341da8970736a9bf18598ba687c320bef09bcc781
font_01_sfnt_off000101e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 10596 bytes
SHA-256: 668aa22d52fadc55fc015f44834191ea3147021f1384c713fc97fde9225a0115

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