Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd23b6aa45675de…

MALICIOUS

PDF

78.1 KB Created: 2021-04-03 05:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 77b1845a5ac77de82c6ba5b14b119e92 SHA-1: 5257a940e76d44899a2e3cf470d9994ae024a0bd SHA-256: 2fd23b6aa45675dec333360e463b4d2d3a8a84d4a81f14ab2663d4aaf270dee5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting a link farm or redirection to malicious content. While no scripts were explicitly extracted, the presence of numerous external URLs and the phishing detection indicate a likely attempt to deliver a malicious payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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=inter+1st+year+english+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423714/normal_60178ab7e959a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366010/normal_5fdf56885776c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462714/normal_605b22962aa8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_602678126d275.pdfIn PDF document text
    • https://cdn.sqhk.co/peposusuwi/dhePKiz/42491185944.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/Chi7his/walafemagepasepi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372371/normal_5fe4d506073a2.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/iehfksQ/dragon_ball_z_mod_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403807/normal_5ff5673a12d4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_606113e29b748.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/kosebetidovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427514/normal_6044d016dc3c1.pdfIn PDF document text
    • https://geligike.weebly.com/uploads/1/3/4/5/134590657/051c6e9d6a066f6.pdfIn PDF document text
    • https://biravozoso.weebly.com/uploads/1/3/4/4/134400929/8bee8d95ae7d9f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0ef60e-2018-4321-883b-c47dc4644242/why_is_my_maytag_fridge_not_cooling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70191be4-1e07-446c-9eff-5f8ca7204fcb/38184034672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e173262-73ca-458b-8ad2-e0c68294da3b/red_burning_rashes_on_face.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4a6106-be9f-474f-bb98-c06f891df1b4/91414692362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1920ffb2-7b9d-4b8d-9c0a-9ce5bde6b7c4/walenipibufuzagokejejagev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4791c866-0c7d-4490-b5ef-ac8c59fbea11/stickman_battle_super_shadow_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2427ebaf-271d-4982-a58d-c1b40356cdd0/33431089485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f81ac1a-1793-4f64-86aa-a529ec056e19/rawubujiwumesifuxejat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3673717d-34b6-42fc-937c-233dcfa259c4/sefedunoxeda.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_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 5596 bytes
SHA-256: 085f4986806c4eaea34eb368be4df3267008202f01c2ab0ab27081c8c334c11b
font_01_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 11364 bytes
SHA-256: 34d28f3e39310b5c6aff4e776718f0470f77d6503bd5041bae4cbd8d5423b24f

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