Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a0c448a697612f…

MALICIOUS

PDF

117.6 KB Created: 2021-03-23 18:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 963098bb0a445d1cff8c60671ffe077a SHA-1: b2e7e111059efbcb34021eef02394099e128dddb SHA-256: 35a0c448a697612f836d0783f8aee947faf20e0148cab915a0dfc7cf5d5c7ecf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on platforms like Weebly and other domains. One of the primary links, 'https://xezojetit.ru/strik?utm_term=in+the+heights+cast+broadway', suggests a lure related to 'In the Heights' cast, potentially for phishing or to redirect to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/strik?utm_term=in+the+heights+cast+broadway
    • https://juziwujaxizeze.weebly.com/uploads/1/3/4/6/134685910/5f6b0a97.pdf
    • http://fresh-ita.fun/198515123504qs0b.pdf
    • https://zolidejowifaw.weebly.com/uploads/1/3/5/3/135313364/fijareje.pdf
    • https://wosiwimobej.weebly.com/uploads/1/3/1/1/131164223/893c1f0fb5.pdf
    • https://sakaromef.weebly.com/uploads/1/3/4/5/134507496/puwoxujexuzepis_bozojari_dizup_semageseret.pdf
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/melerawamugoz.pdf
    • http://lovelid.xyz/nijunekavigavusixubojont0grj.pdf
    • https://wamurereleveti.weebly.com/uploads/1/3/5/3/135392703/d60ffac8846a9.pdf
    • https://vilofezilo.weebly.com/uploads/1/3/0/7/130740065/dojafuzit_naxematuna.pdf
    • http://alsamcctv.com/82415791394hrf5b.pdf
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/lusezosum.pdf
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/watiwekabimimep.pdf
    • http://educationonline.website/nirunonuluvbpywk.pdf
    • http://cafe-cok.ru/oxford_house_applicationhs1dt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zemigiduwagafu/chapter_31_to_kill_a_mockingbird_answers.pdf
    • https://uploads.strikinglycdn.com/files/75719a78-e960-4668-819a-232d0b5cf8e3/wamazanorakasikeke.pdf
    • https://s3.amazonaws.com/fizaxo/33138738417.pdf
    • https://s3.amazonaws.com/legenapi/thus_spoke_zarathustra_best_translation.pdf
    • https://s3.amazonaws.com/rikolesafuwofar/degotabuvi.pdf
    • https://s3.amazonaws.com/salosibejodod/scientific_notation_example_problems_with_answers.pdf
    • https://s3.amazonaws.com/mikibetiv/36923708802.pdf
    • https://uploads.strikinglycdn.com/files/45b5bfce-8116-4e68-86d3-9426ad45755b/prepositional_phrases_worksheets_for_4th_grade.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016f5b.bin
7c2364e4b0ddbab0d66794fc000760c3df5a29c30dc8f9aa522032b8bd843e32
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F5B 8596 bytes
font_01_sfnt_off00018c8a.bin
b37ec4a5a188f4a4da2b8584df7367fafc170faf3e61ed3cdd60e5f2992ee166
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C8A 5440 bytes
font_02_sfnt_off00019f18.bin
86147a4b30da9863a2d05038f919a38ccd8546efa4b2fe1cd787c0a672147a2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x19F18 12832 bytes