Malicious PDF — malware analysis report

Static analysis result for SHA-256 3404f0cd53f71c95…

MALICIOUS

PDF

67.1 KB Created: 2021-03-20 10:17:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a90a5db76ba2d8992666efee03709099 SHA-1: 28fe749e960d2d0e3e51013a55b0e3fc216a59ac SHA-256: 3404f0cd53f71c95686f6c894b88329760ead0ca8906e309c1b25b15981c9c31
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. The document body, though heavily obfuscated, contains text related to sending messages on a Doro phone, likely a lure. The primary malicious activity observed is the presence of a large number of external links, including a link farm, designed to redirect users to potentially harmful websites. One such URL, 'https://jacksth.ru/strik?utm_term=how+to+send+a+message+on+a+doro+phone', is directly embedded and likely serves as the initial redirection point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=how+to+send+a+message+on+a+doro+phone PDF link annotation
    • http://justiciaforjustice.com/fozinunexalopanntksw.pdfIn PDF document text
    • http://blognews.top/digital_fortress_dan_brown_ebookclbc9.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/icdsKig/62855530904.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/aoiijcY/44610758365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387567/normal_5fd8b9a99cdf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_60470786d1732.pdfIn PDF document text
    • http://igcopyrightclient.com/casting_wall_thickness_toleranceowe05.pdfIn PDF document text
    • http://ehaberdevlet.com/2865279017proam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/vivunapuv.pdfIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_fef4b872a1394ffb9385df7e15c15415.pdf?index=trueIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_654d0e37cf2b4b8e987f09e3e1fb9f98.pdf?index=trueIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_873fe283caa74220912076d409755343.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jipowumat/law_of_unconformities.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/sumivixubuzigafinuzava.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/diagnosis_and_treatment_of_lyme_borreliosis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/jikawuw.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/glimpses_of_world_history_nehru.pdfIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_8c8c101a96ea4b5689c2500580b4af51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/samsung_model_wa48h7400aw_aa.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_off0000cb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB03 5392 bytes
SHA-256: ee8c8b9ae585efdb9627768b4b8ca7586e4e76899a931d683c011b8550026697
font_01_sfnt_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 9920 bytes
SHA-256: a438a868e8195d05e04b3dbe8f89c5e569b4b409d9b49f257c17b6b1b14bc366

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