Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c80fd34caa6a727…

MALICIOUS

PDF

77.6 KB Created: 2021-04-07 06:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6341450937559e3f5eb9081789617a93 SHA-1: 7e56e9c5e9a39f3ed4a0926b959142a5abc9bf6c SHA-256: 1c80fd34caa6a727e429d4b5634211ec45cdd858027fd4b3daebf9587529440b
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with at least one, 'https://druttle.ru/award?keyword=a+flower+is+not+a+flower+pdf', being flagged as an external URI. The PDF structure also suggests it's part of a link farm, further supporting a malicious intent to redirect users to potentially harmful sites.

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://druttle.ru/award?keyword=a+flower+is+not+a+flower+pdf PDF link annotation
    • https://xilamexazoleguj.weebly.com/uploads/1/3/2/6/132695560/54b7af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382186/normal_601ccee0b61f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_606cec6978af0.pdfIn PDF document text
    • http://xadexawufomovi.sportsontheweb.net/38894078798.pdfIn PDF document text
    • http://legexebe.medianewsonline.com/ludujuratobikobiruliwam.pdfIn PDF document text
    • http://siluvuxifebul.medianewsonline.com/68700019493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478383/normal_60184c109ddf5.pdfIn PDF document text
    • https://lupagizan.weebly.com/uploads/1/3/1/6/131637074/954a7dd.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/84170723672.pdfIn PDF document text
    • https://jagavovukivotu.weebly.com/uploads/1/3/4/8/134881855/8856525.pdfIn PDF document text
    • https://gogodelile.weebly.com/uploads/1/3/0/9/130969080/7075536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5fe78b7687b1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_f26ec4984b004507ad26833b770a6314.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvarelo/english_guide_for_class_7_ncert.pdfIn PDF document text
    • http://benamow.myartsonline.com/which_garrett_metal_detector_is_the_best.pdfIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_6a29d4a31c6d479196ec5012ac93dd7d.pdf?index=trueIn PDF document text
    • http://damowepoko.myartsonline.com/depression_journal_articles.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/mapavukivepomezek.pdfIn PDF document text
    • http://wugerubuvugox.myartsonline.com/17_day_diet_recipes_phase_1_the_doctors.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_821ffe6f18cb4f86b1b40ac928e51f0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefodek/flsa_overtime_fact_sheet.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_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 5116 bytes
SHA-256: fb7c5cb489cacc609769ce989d676bcb7196d21d556e12c9fd9cf44bd25514e9
font_01_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 11060 bytes
SHA-256: 749b177f3ba6a8fcbc11554d90849349ea40e1d78004e82130b0337f7c0b9123

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