Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6645beff426ba2…

MALICIOUS

PDF

157.6 KB Created: 2021-05-18 16:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 17768a0513a2cb8bd7672c161e6aaf58 SHA-1: 554dc3809c72b74aedad80365a456a9cd517a43c SHA-256: 4a6645beff426ba2c6778ff15b8f4b16e0bfead838876c55cd87f33d6798482f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, including one pointing to 'mezovuduw.ru', suggesting it's designed to redirect users to potentially harmful sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a phishing or malware distribution intent. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest malicious activity.

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://mezovuduw.ru/strik?utm_term=mid+128+fault+code+guide PDF link annotation
    • http://fefikaniki.22web.org/21065230820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_601dcd5ba97da.pdfIn PDF document text
    • https://povufajesozibu.weebly.com/uploads/1/3/0/7/130739002/bewuzujuj.pdfIn PDF document text
    • https://jomigotub.weebly.com/uploads/1/3/4/7/134748998/e28dc561d.pdfIn PDF document text
    • https://vifixizunegivu.weebly.com/uploads/1/3/4/3/134349865/323f7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459941/normal_605173cc69c97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453342/normal_5ff903e6acf4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485693/normal_605176b9e2ad2.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/11d2e5920da1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_6023f3e5ae03d.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/sorawifa_nireduliradu_puwab_babelorakupopa.pdfIn PDF document text
    • https://gebodakejodige.weebly.com/uploads/1/3/4/3/134316683/698625.pdfIn PDF document text
    • https://zugufanebuloko.weebly.com/uploads/1/3/4/0/134016669/laperebojemefut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_601fdd2778ef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_602b57698deb4.pdfIn PDF document text
    • https://sokasabakowupop.weebly.com/uploads/1/3/4/0/134012989/59f11cd7f7d3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafilijesov.epizy.com/beautiful_things_chords_piano.pdfIn PDF document text
    • http://xorewabamav.epizy.com/681665180.pdfIn PDF document text
    • http://xafegewoweli.epizy.com/arjun_reddy_telugu_movie_cinema.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_off00022fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22FE1 5296 bytes
SHA-256: 77ad8a407b8d57609fe544bc37fb2a42e67dc77ced6a31bc33f525c3363d2bb8
font_01_sfnt_off0002420e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2420E 11440 bytes
SHA-256: e39fbee6712e488e5edba4c1d942589b7752238e3d6f9bb93b7e9141a1970fa0

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