Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0191f4d1403448…

MALICIOUS

PDF

83.6 KB Created: 2021-03-22 04:10:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d9ad08cdb1caf6ea100fa8350013829 SHA-1: 79632f9800c8637917e0726e56d4cc618a7e6bd6 SHA-256: 2b0191f4d14034483d51a78c6297773a55ae8d35b5ae522eecbfafe18945fb07
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external links, with a significant number pointing to potentially malicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a malformed attempt to disguise itself as a search result for a book, likely to trick users into clicking on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=bruno+bettelheim+the+uses+of+enchantment+pdf
    • http://fafesixokegigi.getenjoyment.net/zozekusubugowiv.pdf
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/23cb1c86.pdf
    • http://podifodosej.scienceontheweb.net/86744449617.pdf
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/9997362.pdf
    • http://fusubakitakudup.66ghz.com/58768060343.pdf
    • http://fizarumokugafu.mywebcommunity.org/70619248057.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_5bf222c9f01e4174bc5e957b326c7b12.pdf?index=true
    • http://bitenozof.atwebpages.com/mmrc_dyspnea_scale.pdf
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_092255076804446a94218d3db49537eb.pdf?index=true
    • http://fiwabafedazuv.epizy.com/ascii_code_table.pdf
    • http://kijemuf.epizy.com/game_studio_tycoon_mod_apk.pdf
    • https://uploads.strikinglycdn.com/files/a1f01f7f-b26a-4a02-912f-a4f9a0ee462e/xodanololonafejobovuxe.pdf
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_c9694ce24ae049a99f76ed233055d787.pdf?index=true
    • https://uploads.strikinglycdn.com/files/404fdb2e-a72d-4f9d-8650-64986621d0d9/6091773711.pdf
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_618eeaf8239c48419f9358d01af4ab9a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/993a6978-ee62-4e2a-9cb2-26f0cad76f85/10659436338.pdf
    • https://ea0a6730-5b47-42bc-899c-5b27b21b32ea.filesusr.com/ugd/184298_cb4f1854446c45be95a737653ac20475.pdf?index=true
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_b9dbb14c013d4df4b6f8bec244ef1211.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108f8.bin
085b7408e2df418c33aff8b9e048e912503fba87e840809d788721e9e146aa1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 5584 bytes
font_01_sfnt_off00011bc7.bin
fb73a45fe5bd92a1d95c4dd03ad755610ee471349afa494d17bf299dde9b1953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC7 11284 bytes

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