Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e7f78739d6783f…

MALICIOUS

PDF

80.8 KB Created: 2021-06-07 01:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2952a025f99a4ee081f3fbbb42c5e6bc SHA-1: df9338a7ce9905cec1918aec5e5d5ac4a1708c53 SHA-256: d2e7f78739d6783f5d56b8f6e44a4c6640e709ee3d81b66394d59f79f57102f7
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/pbw?utm_term=how+to+make+a+square+pyramid+out+of+wood PDF link annotation
    • https://kevosenebiv.weebly.com/uploads/1/3/1/8/131871602/vujaxeruzez.pdfIn PDF document text
    • https://gumopokexu.weebly.com/uploads/1/3/0/8/130814161/fcd835441e.pdfIn PDF document text
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/6161cc88c.pdfIn PDF document text
    • https://garururukipu.weebly.com/uploads/1/3/4/2/134235121/1340892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5fd1dd944c7b8.pdfIn PDF document text
    • https://nozudepoget.weebly.com/uploads/1/3/1/1/131163917/7490652.pdfIn PDF document text
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/6602752.pdfIn PDF document text
    • https://lowixuwegula.weebly.com/uploads/1/3/0/7/130775587/44d4b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_602753641d961.pdfIn PDF document text
    • https://zowomotoridaxa.weebly.com/uploads/1/3/1/4/131438570/25e2e05b293c85.pdfIn PDF document text
    • https://tunugezujemis.weebly.com/uploads/1/3/4/3/134307821/7c465f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xixokuzujoz.pbworks.com/w/file/fetch/144568275/64833708482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe758df-5267-4c85-a47f-a0bd69e3a5a7/team_fortress_2_hat_generator_v5_download.pdfIn PDF document text
    • http://natofuke.pbworks.com/f/sufeveruwaseniwegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/395d0d69-89e4-4a36-ba0e-6a2b762dbb5c/14724961450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/810518ce-10bc-40f7-852d-b2199f8b61fc/what_type_of_organisms_use_cellular_respiration.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/f/9472843404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715d88ab-4664-45c5-9bce-4a362c6616d8/my_mic_wont_let_me_talk_but_i_can_hear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e46321-1709-4016-82b2-4fc6b78c7f01/handy_stitch_manual.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_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 5500 bytes
SHA-256: 0c24fd5ada770d573b571ab8cc990791ef66972465085280f3d98e90cf000e63
font_01_sfnt_off00011135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11135 10772 bytes
SHA-256: 51f7e52872f1e5fd8cee5b1d234e8dece040215a64ad3fcc0808a4777d98a76d

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