Malicious PDF — malware analysis report

Static analysis result for SHA-256 b816840376521984…

MALICIOUS

PDF

73.6 KB Created: 2021-03-03 00:36:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 207849533d03090ca02d0340f39411d1 SHA-1: 4c4ae7613ca905b6b9e2208ee56a96aea4872c8d SHA-256: b816840376521984ebdb5808c7ba8a97c8b783bf4d7f3d1523e4001ff9289936
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain 'druttle.ru' that is likely used for phishing or malware distribution. The PDF's structure and content suggest it is part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/award?keyword=wd+my+passport+wireless+pro+3tb+review PDF link annotation
    • https://cdn.sqhk.co/tejosepu/jSKjchb/29129174649.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453914/normal_5fc56f302d034.pdfIn PDF document text
    • http://olymptrade.buzz/42854481231r2695.pdfIn PDF document text
    • https://cdn.sqhk.co/leruwexikud/hal6FPh/police_officer_costume_plus_size.pdfIn PDF document text
    • http://rababevaju.22web.org/zebaronidavafetodo.pdfIn PDF document text
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/kugidotisuxeroxudu.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/639dea.pdfIn PDF document text
    • http://rozel.ru/remajitetm2omt.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/paxuvagal/what_are_the_characteristics_of_a_highly_sensitive_person.pdfIn PDF document text
    • http://fudotebu.epizy.com/5152535276.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/taxugoraguduvuxesi.pdfIn PDF document text
    • http://jasudewibolix.rf.gd/14021571192.pdfIn PDF document text
    • http://sezulezaba.rf.gd/telugu_movie_video_songs_1080p_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/prepositional_phrases_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/47833487669.pdfIn 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_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 5676 bytes
SHA-256: c137ef245bb43993f0fa0a294bcce28fd4b669404a77cb770c93d85652c65876
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 10504 bytes
SHA-256: e9e29a3728f21214af459da081dc9d9119bb632a868c81e4d8f8015e3fb87bcd