Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd1b1c3c08f4024…

MALICIOUS

PDF

84.4 KB Created: 2021-03-08 23:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ed102b065fa821f75f4b3604178f3a1a SHA-1: 9759809cbce67d5fb89bfb10530df8842d24f75d SHA-256: 5dd1b1c3c08f402437e488da10ad4f17a46d9df587886d9aeb521e4ce69b5bc2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many of which are likely part of a link farm designed to improve search engine ranking for deceptive content. The primary malicious URL identified is https://jacksth.ru/award?keyword=computer+related+full+form+pdf+download, which is likely used to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=computer+related+full+form+pdf+download PDF link annotation
    • https://nunebavakagepas.weebly.com/uploads/1/3/4/4/134446468/5310431.pdfIn PDF document text
    • http://linudanozuno.iblogger.org/kindergarten_2_outfit_guide.pdfIn PDF document text
    • https://vidimepimexuja.weebly.com/uploads/1/3/4/6/134626803/02541.pdfIn PDF document text
    • http://xawinagolagiju.iblogger.org/45227763056.pdfIn PDF document text
    • https://ganuwikudafo.weebly.com/uploads/1/3/0/7/130775291/webuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_5c4dfa52f1fa44099a82ed3426a0e839.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavabi/78088131310.pdfIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_b86125c4bf5248259be3db57657e0f39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1bd62f5-1aba-418a-9402-edca24a2f9f3/sodafomirajovoku.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/bimel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996d5b02-a0d4-4bbb-9ebe-c0659f0f6c79/33223645606.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_c62cd6256a7948988f9faa12aaf7046e.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_77cd46f10d23402092b3c6429c58854a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vosimalume/joe_brainard_i_remember_film.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/excel_sheet_background_image_no_repeat.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_5194da4d9af2470baac359eb0409465c.pdf?index=trueIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_c9b69a9a6e9f4f5fb8a70013340a5ab1.pdf?index=trueIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_6653e6883e214eafa1a87e243a89fe6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/88076801032.pdfIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_1bb2e6efea304676a854703898347377.pdf?index=trueIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_ce67224018354d18813cd8844575e634.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 5004 bytes
SHA-256: b65df38aa8c645dbb345808e83aaca3373fb439e3da9aceb0876f8cc860ef88f
font_01_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 10772 bytes
SHA-256: 30522bc1de08231736bb4d35c609481d5447bd7ff4b9dba91ee963b70d27502e

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