Malicious PDF — malware analysis report

Static analysis result for SHA-256 8953b412784bc625…

MALICIOUS

PDF

77.3 KB Created: 2020-11-18 11:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4991b4d3c40bb65df1b6871a1cdf28a0 SHA-1: d579274b4933d0112a2ba0277f4143e405236431 SHA-256: 8953b412784bc625d421ba5f7821e17aa822a92b74eca95fed626f3347e71eca
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests an attempt to distribute malicious content or engage in phishing by directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=hooda+math+run+2+unblocked
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/kirisefowefale.pdf
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/potize.pdf
    • https://zijovegumasapal.weebly.com/uploads/1/3/4/3/134307166/jimuxolozare_sasokido_nilaranur_poxodilil.pdf
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/37cf9c.pdf
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/roretita.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/66b3a969-e0e3-4b11-92b5-f1c5ab649d95/tigefi.pdf
    • https://uploads.strikinglycdn.com/files/ac5e7a96-fc6b-4275-b4b0-e7d3d6f1b067/zindanlar_ve_ejderhalar_oyuncunun_el_kitabC4B1.pdf
    • https://uploads.strikinglycdn.com/files/42c0b4b7-b875-4ac5-9a08-56923672274b/54830770025.pdf
    • https://s3.amazonaws.com/pafexegud/android_convert_byte_array_to_base64_string.pdf
    • https://s3.amazonaws.com/bisazabe/advantages_and_disadvantages_of_information_technology-_wikipedia.pdf
    • https://s3.amazonaws.com/rijedifatufod/33034677194.pdf
    • https://s3.amazonaws.com/tesodagiwor/split_and_merge_files_free_online.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_off0000e3d6.bin
316768ab5b4d3081dd42b440f7ed5127a3c602b94ca979d2f7e5ae4a44bb8568		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 3736 bytes
font_01_sfnt_off0000f122.bin
a440f735f1744a95271fb5195c01189167e550789f93be7f94bce5da53ed7fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 5300 bytes
font_02_sfnt_off000102f8.bin
701558a052231de5a30a84e25b98e15c9a4dc92681b79db9ebb433827699bef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 11556 bytes

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