Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4b681a8cc0f859…

MALICIOUS

PDF

81.4 KB Created: 2021-04-02 19:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 46f7878af9b15c59d53a1885af464014 SHA-1: 0f157f0d9ca9e0cd6886a7c4b020b8697194d2b6 SHA-256: 4d4b681a8cc0f85961837f47c0cabcbca7490f8cb00e67bcdbd92ef89a0f2bed
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 0.9996

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://kuzutuzo.ru/wix?keyword=should+i+share+my+ice+cream PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483075/normal_6055528174308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_6065fd5563695.pdfIn PDF document text
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/9cb29c3c6796a7.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzokikili/idghhhB/guide_gravures_verres_progressifs_essilor.pdfIn PDF document text
    • https://cdn.sqhk.co/runusamopit/jhaBkhc/heroes_of_order_chaos.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/2ihCyoz/truck_simulator_europe_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417030/normal_5fda73c6cac76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_603c17ed5fa26.pdfIn PDF document text
    • https://vekatugid.weebly.com/uploads/1/3/4/5/134592715/9711106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387035/normal_5feb011227b59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5fc9aaa449b2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5fdd14c6b8893.pdfIn PDF document text
    • https://cdn.sqhk.co/zavilisuga/Qi2E0jd/wiwafo.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://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_d21a3cf188dc4efcbcbc5fc4c6b6fcbf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/51807442022.pdfIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_1887edfff6f6415d98b2509889edb9c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobaziw/18997725978.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/33677164720.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_839aa0c25b4a45ae8fca2fda855bbabb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/how_to_mount_a_tiller_outboard.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/pazovubujoviraruxerow.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_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 5080 bytes
SHA-256: b0f6f26c1fc2516c393ff1c6c1ef41cc49449990daa7123ee78803b17eb9181d
font_01_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 11128 bytes
SHA-256: 5b393a62aec529ac8af992095eab8ff8d6bf6a2e656c09b3a89d0e616cd3f25f
font_02_sfnt_off00012a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A08 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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