Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9a7dcd3b70b7de…

MALICIOUS

PDF

82.1 KB Created: 2021-03-27 15:26:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4c6dd35dfd2c96d79ef454042af2e338 SHA-1: b76c3cae2d51ab54836a54e7ada0131b3f7b0697 SHA-256: 9a9a7dcd3b70b7debcd71f61070055fadaf199253c4b0fc2b67ae759421c6ad5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with the primary one being `https://jottigo.ru/award?keyword=nursing+interventions+for+depression+pdf`. Heuristics indicate this PDF acts as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious 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://jottigo.ru/award?keyword=nursing+interventions+for+depression+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374715/normal_603cf3af5fede.pdfIn PDF document text
    • http://tasunixupowife.66ghz.com/business_english_speaking_worksheet.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/608c65ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368759/normal_6000b3f1df085.pdfIn PDF document text
    • https://cdn.sqhk.co/jimatoju/hijfii0/water_slide_amusement_park.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_602a321b125d6.pdfIn PDF document text
    • https://libakitaxejadeg.weebly.com/uploads/1/3/4/0/134096258/fozijokemoxi-tukisoge-xivudawolim-nuzijusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425924/normal_603427cfa2f5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465403/normal_600cb3cd3b83f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393904/normal_5ffe413898a66.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/biejak4/72332120848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462379/normal_5ff5cbbce6d00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401985/normal_60052321c90c4.pdfIn PDF document text
    • http://funokeronox.iblogger.org/neolithic_revolution_essay.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/wotojiniler-wixawexefukux-fezus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuxejerudaxis.rf.gd/materiales_dentales_craig.pdfIn PDF document text
    • http://kojevas.epizy.com/rafixojugatil.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/63923542178.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/weperaj.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 4996 bytes
SHA-256: 6621d7e9e490f1dcf0efd62d5b8366d38a3b1209abbe1a7c73fbd85f81d937c9
font_01_sfnt_off0001156a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156A 11160 bytes
SHA-256: fc6073435797730b2dca25a98666bd407f4e64087ba50e942e2f548b59d3196d

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