Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a491b15a5aaa83…

MALICIOUS

PDF

98.2 KB Created: 2021-01-15 01:17:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7f42dfdd596108f8deb53b24c420ca76 SHA-1: 4105ee7481f2e51f6b7a2dbed4dfefa639304120 SHA-256: 58a491b15a5aaa834a87adcab52ea439ccaa6831b9dcaf2d49f545227b68a405
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, directing users to various external resources. One prominent link, 'https://traffine.ru/wb?keyword=afk%20arena%20tier%20list%20pve%202020', is flagged as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/wb?keyword=afk%20arena%20tier%20list%20pve%202020 In PDF document text
    • https://sojekaga.weebly.com/uploads/1/3/1/0/131070529/03660530466ab.pdfIn PDF document text
    • https://site-1175316.mozfiles.com/files/1175316/40584595871.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/jjhchgG/car_simulator_m5_apk_hile.pdfIn PDF document text
    • https://vurozagagi.weebly.com/uploads/1/3/4/6/134695821/xumidof.pdfIn PDF document text
    • https://fajubixinusejeg.weebly.com/uploads/1/3/4/8/134850070/fe0e70ad9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/damerirazib/fgo_gamepress_camelot_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/78301765531.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/43867233021.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/zunekitav.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/kezavexotuziminufezufagon.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/60515197977.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/rawajuz.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/januduz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13803 4960 bytes
SHA-256: 75775b1360d92fbe3624384d86d11278ad984b874632a41b9b36bb0a5c4e0a9a
font_01_sfnt_off000148e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E9 10752 bytes
SHA-256: fb6e2358298c8bfa630c10f3fae5aaedd539910ded3f4935f11f5bb531030ef5
font_02_sfnt_off00016da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DA1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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