Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5232904d46b8307…

MALICIOUS

PDF

75.2 KB Created: 2021-03-30 11:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99321674525bc5eeb1f4badcb54da991 SHA-1: 06a2c552d8b3014355fb7a3f4fa0effb89cb30c0 SHA-256: f5232904d46b8307c532c665fecd1f130149fddb0ee60eba6257e461089012be
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common technique for distributing malicious content or conducting phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the primary attack pattern involves directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=locomotor+skills+definition
    • https://cdn-cms.f-static.net/uploads/4381105/normal_603a6716b42e2.pdf
    • https://cdn-cms.f-static.net/uploads/4409818/normal_60136db23f274.pdf
    • http://mudipodixanal.iblogger.org/zovufobupokexititipuwuzo.pdf
    • https://cdn-cms.f-static.net/uploads/4486351/normal_60525dbef1584.pdf
    • http://loseriwudovo.22web.org/acurite_thermometer_manual_00592tx.pdf
    • https://static.s123-cdn-static.com/uploads/4387040/normal_600504413b39a.pdf
    • http://vevapefin.sportsontheweb.net/by_the_rivers_of_babylon_book.pdf
    • http://lilozekakotelup.sportsontheweb.net/futebivirovidugobeforus.pdf
    • http://wutanumijejol.sportsontheweb.net/is_there_a_way_to_turn_on_vizio_tv_without_remote.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lojiwifi.epizy.com/liniwowasiderebop.pdf
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_bed1e76546974baa8744cf255c4deaf7.pdf?index=true
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_73307ad71daf4bd2a22eb7cd3b547e6b.pdf?index=true
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_0f741b9ad1494592813f0148d88d0783.pdf?index=true
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_9d7e7728a1954fb6af6d726d8b0d9217.pdf?index=true
    • https://s3.amazonaws.com/tezofuretejom/1920396092.pdf
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_1ee2567b39034147af39128183839b0e.pdf?index=true
    • http://gemawinikifiv.myartsonline.com/99131587860.pdf
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_c05591db2b34455bbf84f5e4a3b2e131.pdf?index=true
    • https://s3.amazonaws.com/sefabe/sikesikevavevenilemonome.pdf
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_a7bce69fcd914e71a17987d014ca2330.pdf?index=true
    • http://nasezerusutupe.rf.gd/pakifuxuziwokuziruzug.pdf
    • https://s3.amazonaws.com/zuses/english_grammar_and_punctuation_guide.pdf
    • 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_off0000ea8a.bin
def0ff8d0e2e16c3509cd6b42fc9efa3c81d536e9cc67c41233eac88f4c9c4b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 4964 bytes
font_01_sfnt_off0000fb5f.bin
4f12bac15581f3bbb14d6fbad85488d68e7031f0032dd2b3a720389d4cb63d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 10704 bytes

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