Malicious PDF — malware analysis report

Static analysis result for SHA-256 731b28f1541d5361…

MALICIOUS

PDF

75.0 KB Created: 2021-05-13 00:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a0db42142a3a646effdceb570d0c06e0 SHA-1: 53ee4658cca71d9648f4af3d8316bfb27ce8779d SHA-256: 731b28f1541d53616b4abda9048456379c30f7a6d5c41dee330e4945436d1c8e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://vilenefex.ru/strik?utm_term=17+day+diet+cycle+1+egg+recipes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450256/normal_6050eb9297210.pdfIn PDF document text
    • https://cdn.sqhk.co/lexikegije/gggDibi/dead_zed_3_hacked_unblocked_weebly.pdfIn PDF document text
    • https://cdn.sqhk.co/japedovak/YhdxFBR/53885740616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_6062ba5b7e21c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483623/normal_60057f1d3bd2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412896/normal_606aee80324f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420760/normal_5fc9abe30c0a8.pdfIn PDF document text
    • http://fafirofekow.22web.org/spring_framework_guru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/26cf9ca4-76a0-46c6-874f-c86148173c80/proto_reflex_rail_2014_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/benaam_movie_songs.pdfIn PDF document text
    • http://vopisatewegom.rf.gd/biopsicologia_john_pinel_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2532ce5-729c-4841-8792-db3905f7564e/mr._coffee_espresso_maker_cleaning_instructions.pdfIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_10675f8e290a40adbf2f547f69fc7f08.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xipavir/am_alone_images.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_08bbf71dd7b34ce291a7b8358970034c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d05d653-8ece-4df4-aae8-256217faed34/thus_spoke_zarathustra_kaufmann_translation.pdfIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_294049d99afa483c8e0602c3f90c9075.pdf?index=trueIn 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 5

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_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 5380 bytes
SHA-256: 0e17bcea3161656941142556325ea3a55a890961747abf3ce5fe67bfc2b127f2
font_01_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 11228 bytes
SHA-256: bedeb24a25e88bbec2344f9e959d55e7498da60fb83a6e894e137af3c2bd8ee0

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