Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c6259ee0a007fb…

MALICIOUS

PDF

109.4 KB Created: 2021-03-09 09:59:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4fdc89fee0baab3a2dd1134153dfa8a9 SHA-1: 11665c7419a7fe39367c3a8e6abe7406d6cdb539 SHA-256: c2c6259ee0a007fb02e93c080fe71a0405693d7c4201b6737ea390cbc8fb926f
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 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 0.9997

Heuristics 5

  • 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://resalured.ru/123?utm_term=coupled-+mode+theory+for+guided-+wave+optics PDF link annotation
    • https://cdn.sqhk.co/rigizisojix/Q2gzhdg/kikokemusavotone.pdfIn PDF document text
    • http://lastasked.com/vopowedafamuxovamuk0cubc.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/qhcWhfw/435626798.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/jbBhgjh/xcom_enemy_within_android_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/BjbWhas/sekimu.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/ibjhKjd/talisman_antonym_thesaurus.pdfIn PDF document text
    • http://pusudekevuwew.22web.org/how_to_edit_a_file_for_free_download.pdfIn PDF document text
    • http://jumebotar.iblogger.org/2007_polaris_sportsman_500_x2_wiring_diagram.pdfIn PDF document text
    • http://ogranifruit.space/56215801753i1c0r.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/hd8vidV/jizojo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_9809cf8d1f6849b4b2902b32b4aae50d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/971d61a8-f298-40cf-a043-6fea8ca69765/jesijisipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2d08473-18e2-4b89-9231-1c39cb49db6f/robert_e_howards_conan_roleplaying_game.pdfIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_062e145faedd47929ccc1cf3bf7079cc.pdf?index=trueIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_a374217497764d47aeb6ea8000e2c5e1.pdf?index=trueIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_cf6e05ca6bca49e2951d19472f55312c.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_dbebe5e01211466baa600d59266ee28f.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00018d42.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18D42 17736 bytes
SHA-256: 669ced2390ad8732cbe7e5c04953702b0c57254de12f4a0b0fda3aef3eae7b10
font_00_sfnt_off00015157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15157 5760 bytes
SHA-256: 14b7a04de6d7e76f12b98c60e007ea8dd178e51885589a1ae3f3fd8980cb5071
font_01_sfnt_off000164e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E4 12300 bytes
SHA-256: 7c23e5b6e9fbf979f67cc8daeee58152899d6bbc3806f1c6e598af5915c1097b

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