Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee99c6b6512a711d…

MALICIOUS

PDF

86.7 KB Created: 2021-03-17 09:29:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a650bc917eb4bea746553960ffd7b77b SHA-1: 9a765ecf5706846f14ec29ac5350678cf21ba315 SHA-256: ee99c6b6512a711ddf1fe84f75c92e7c04c3cb71cd4044332f0f897dba9a5b42
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/award?keyword=data+acquisition+device+pdf PDF link annotation
    • https://tomutoremaduv.weebly.com/uploads/1/3/1/3/131398477/doruwelote.pdfIn PDF document text
    • https://bajigexok.weebly.com/uploads/1/3/4/1/134131467/lojesazu.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/ggfCvhh/over_70s_free_radio.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/1AhbEib/47685753236.pdfIn PDF document text
    • https://fopulowaledini.weebly.com/uploads/1/3/1/6/131637921/18197.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/ebfef2c4-a283-4329-b627-77226dc93957/what_is_memory_mapped_i_o_and_i_o_mapped_i_o.pdfIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_c07eda715d9e4422bee574c94e9e74ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dekogamik/96396836229.pdfIn PDF document text
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_edbfbf12ea2340e5bf94a881c429982a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/what_club_to_use_to_tee_off.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_6a229379d18a450695995feb1fa113ba.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_b9f6eda29061404e8ad7b76298468ee3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1f3a0f2-afd7-4c7a-a2d9-1032040750ca/suing_a_county_judge.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_0e9af4119ec54b9b861448f843c92b5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7a4f628-5f60-4bfc-8027-8fee95fff403/45067545701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a856cb9-c828-41d3-8e94-7d6b8dd6f023/ascii_code_binary_c.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_5ac14fb5a32949e9bdfa075f20a053ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/dubilamoraj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4f95b0e-2189-423d-9f37-c28d7bfbb85c/michael_pollan_64_food_rules_list.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_off0001161b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161B 5208 bytes
SHA-256: bcd58678db0da4c852497010afb13511644fdc69a7853ec6971aa99be3584937
font_01_sfnt_off000127f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F3 11112 bytes
SHA-256: b7d22eba061217cdcc1cca2740faa974eabc0f4abcba39cece82014468fd847f

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