Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cb896fdebb4a4b…

MALICIOUS

PDF

71.0 KB Created: 2020-11-13 23:17:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 24b04da4a11d4e9cc7fc8520b7374187 SHA-1: 9d618d097efb01c64d73e6c59ae1cf20a1f28b6c SHA-256: c7cb896fdebb4a4b042f86fce73ce4b6e9ebacfc919adf576be14b5789e3e140
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://traffking.ru/123?utm_term=best+gail+carson+levine+books PDF link annotation
    • https://sejevijuwev.weebly.com/uploads/1/3/2/7/132712154/jifub.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/5c3862a640e9f.pdfIn PDF document text
    • https://bijimeko.weebly.com/uploads/1/3/4/3/134327756/d1b90f6388197.pdfIn PDF document text
    • https://danenogamapan.weebly.com/uploads/1/3/4/4/134481258/podusatov.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/1068465.pdfIn PDF document text
    • https://deserekinubolid.weebly.com/uploads/1/3/4/3/134319780/zogutatila.pdfIn PDF document text
    • https://mixirarorasuju.weebly.com/uploads/1/3/4/3/134317495/0597a0f695648.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/fb534639-dc08-406e-8091-4c9245b8db9e/jemewujezot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e854aa08-10e1-4ca7-9ffa-b420fa347cc4/sunelifarigirusemej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892fbe5c-5a5d-4223-a9e7-a2b68ac323a1/teresa_giudice_instagram_bodybuilding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af18d73-d996-4ac6-ae9c-559a6dbb56ea/best_spells_dark_souls_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b8f10da-ac42-4953-a295-24df0243f803/educated_a_memoir_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a718b250-70ce-4e30-80ec-0586189ed61f/laregiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/786550d5-295c-459f-94bf-f93b901bab0f/wwe_2k14_ppsspp_android_download_highly_compressed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded7f4ce-2bf7-4c98-9f39-4db41b6bc7b3/western_union_money_transfer_form_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a9b043-1eb8-4c60-819a-2c7e34683b06/fuvami.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_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 5280 bytes
SHA-256: 70f6da3c7dac56469777d3726ad2e5bf384483dc97ad1170746624235022606d
font_01_sfnt_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 11556 bytes
SHA-256: f35c8a75e342e9e243549221f127da104719460f0856a4b0ef7e1d10bad03ffe

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