Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7dee9c10023df14…

MALICIOUS

PDF

64.6 KB Created: 2021-01-24 11:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35f6eab37882f1bb48037b63f9cb90a9 SHA-1: 73722c817b3484447d8d4a0ffcbd07940b8efffc SHA-256: d7dee9c10023df14f427f859a60c07afcb41f41871ebb297bacf0686dbc035be
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely leveraging social engineering to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/aws?utm_term=vowel+and+consonant+digraphs+worksheets
    • https://limifotediko.weebly.com/uploads/1/3/5/3/135325738/5847549.pdf
    • https://kokubuzo.weebly.com/uploads/1/3/4/0/134017800/d1310a1.pdf
    • https://nozusetemakofam.weebly.com/uploads/1/3/1/4/131408546/logavejogalugaban.pdf
    • http://masonufidowex.iblogger.org/archers_podcast_won_t.pdf
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/7474157.pdf
    • https://rerupogom.weebly.com/uploads/1/3/0/8/130874691/7156376.pdf
    • https://gademivovemoxu.weebly.com/uploads/1/3/1/3/131383546/3396897.pdf
    • https://fububekamuko.weebly.com/uploads/1/3/3/9/133986391/semajerik.pdf
    • https://nokavapeselodes.weebly.com/uploads/1/3/4/6/134638024/7111842.pdf
    • http://fumuponi.22web.org/social_media_marketing_proposal_templates.pdf
    • http://vijoxufomodazug.22web.org/22216998768.pdf
    • http://nefuzixitelu.iblogger.org/68028635952.pdf
    • https://rukatopuwor.weebly.com/uploads/1/3/1/1/131164291/vigopivefi_jefopozemogit_ritonisagir_mitebakexesen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dexifuv.epizy.com/tools_for_formative_assessment_k_lambert.pdf
    • http://barirenuvekesup.epizy.com/cdc_vaccine_ingredient_list.pdf
    • http://juropap.rf.gd/5464386697.pdf
    • http://pususarejopo.epizy.com/xavuladir.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c03e.bin
e7d4050eafe85ac97a3a535973e7d6cc186bdf36579afb659d4cf3062c0171b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC03E 5456 bytes
font_01_sfnt_off0000d2dd.bin
4934035efad21746a27e9b63cf02b48ff0885d6153bb6c0be652ac6e2ed3e3ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DD 9944 bytes

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