Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1a29876f1251c8…

MALICIOUS

PDF

81.0 KB Created: 2021-04-28 06:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2a30064b0302f45952cc1a74acd7f8fb SHA-1: 98572d31852a32dbecbd0fb5d8871d569ae2555b SHA-256: 0b1a29876f1251c828221b396db8c020a82c55caefa4286780b8eccb666801c8
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://leonvi.ru/strik?utm_term=resistor+color+code+calculator+download+apk PDF link annotation
    • http://wamuwosola.mygamesonline.org/dumozopidusewifota.pdfIn PDF document text
    • https://rajulotopeza.weebly.com/uploads/1/3/4/6/134665566/358607.pdfIn PDF document text
    • http://shimano-stradic.ru/vemizadosorepujaoxs2x.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/fafsa_form_2020_19.pdfIn PDF document text
    • http://easybranding.org/garawaserewo96d2c.pdfIn PDF document text
    • http://best-ital.fun/duterefenokawoxekofh2ht.pdfIn PDF document text
    • https://sasogobol.weebly.com/uploads/1/3/4/3/134387633/579533.pdfIn PDF document text
    • http://semengergel.ru/is_being_in_the_dark_bad_for_your_eyest0ufl.pdfIn PDF document text
    • http://vittorguxx.site/ample_guitar_m_lite_vstc5tfh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_3c67a5646c5b4e60af48f4215f145d60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6206219-6f72-4286-86b9-52c4edff7bfe/can_the_battery_be_replaced_in_a_roomba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/477eaad5-6edf-4627-be7a-edf34e0209ed/gefetitagej.pdfIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_592c912af16c425eb3f59042bb1e9dc0.pdf?index=trueIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/noxibepigolagatimoni.pdfIn PDF document text
    • https://45b2e380-1b2d-4004-bd36-95a0794902ed.filesusr.com/ugd/e3c460_106726173ce54dcb9a89241f4993a398.pdf?index=trueIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_a586941ea15341ab89ee6d4ee011d929.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc86632-7a20-468d-a1ba-3bcae362e3b7/what_does_a_burning_red_rose_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e528c6d6-dc5e-476f-85f8-6ecabafef7bf/rudasoku.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_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 5228 bytes
SHA-256: 26f97de0f9f9790a98b70855ee94faa28b83bb6e4d4e9717fac589ff3a31ffd5
font_01_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 11808 bytes
SHA-256: de75c8342f940b492e1e71d71a6495dd0439cbc80ddf1abaa9ebef94427933c9

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