Malicious PDF — malware analysis report

Static analysis result for SHA-256 505d2834e8bdf4e8…

MALICIOUS

PDF

84.2 KB Created: 2021-03-29 20:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4eeb7bfd86836418eaabcc156754eb8e SHA-1: 1874754664ed9e53a89fef01bb1eb4c7d44c2156 SHA-256: 505d2834e8bdf4e8c9b21aac87ecc2f8dfded7694bba948e4d217d66861fbb7d
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 0.9998

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://leonvi.ru/strik?utm_term=evolution+is+a+fact+quotes PDF link annotation
    • http://dronextactical.xyz/40401954566m6kck.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_5fe8c89b0d6f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_6049ea733203b.pdfIn PDF document text
    • http://piwupulor.iblogger.org/xitezuvixi.pdfIn PDF document text
    • http://tezatigobupuvu.22web.org/oliver_sacks_awakenings_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_603488a328dda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_5fd63c988f595.pdfIn PDF document text
    • http://tonerinkstore.com/2_kids_1_sandbox_orginal_video2o4az.pdfIn PDF document text
    • http://specrazreshenie.com/washington_post_covid_variantg931t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388842/normal_5fdd66fb0ee22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_6022999176500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_605bc8f1d91bc.pdfIn PDF document text
    • http://notdull-eng.online/how_to_hack_fifa_mobile_20_without_human_verification_iospnbi2.pdfIn PDF document text
    • http://testertumentum.space/81423813818bs95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fibesezati/41381533882.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/24304349695.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 4804 bytes
SHA-256: aaa9d50a30c806bc57bacffcfa2459bdd4566479936844f49a826a22ba02d05f
font_01_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 11076 bytes
SHA-256: d092c41c395cbbcae0db42e882ec4dfc6b4a6e12967cd51d3de2b9d25a3fa507
font_02_sfnt_off000133c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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