Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d06c6d92fdbfebe…

MALICIOUS

PDF

78.6 KB Created: 2021-05-31 23:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58906ff113ce3ab9218334ccdc01438e SHA-1: 76a769a11afdc8775982f95fed77f5c178426dc2 SHA-256: 2d06c6d92fdbfebedf1293fb17e1fbe42b45d2bfbff17df392a68ff8175290cc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, suggesting a link farm or a mechanism to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards an attempt to exploit users through deceptive content, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://krisoc.ru/pbw?utm_term=authorization+letter+sample+for+cenomar
    • https://cdn-cms.f-static.net/uploads/4497650/normal_604b63417b5ec.pdf
    • https://legunumazonum.weebly.com/uploads/1/3/4/4/134455594/3239262.pdf
    • https://zewelujipe.weebly.com/uploads/1/3/4/8/134846298/todit_tunubixofupi_gunuvawin_xoxobasefebovo.pdf
    • https://cdn-cms.f-static.net/uploads/4450047/normal_605f5ba1a8e2a.pdf
    • https://nanuvofekoredam.weebly.com/uploads/1/3/5/3/135385966/1340241.pdf
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/vikanulokelave.pdf
    • https://famatogovux.weebly.com/uploads/1/3/4/6/134614416/1754f68f.pdf
    • https://cdn-cms.f-static.net/uploads/4379473/normal_603e7651e2d51.pdf
    • https://cdn-cms.f-static.net/uploads/4464739/normal_604d4e04d75ea.pdf
    • https://static.s123-cdn-static.com/uploads/4403820/normal_5ff12089aadc7.pdf
    • https://cdn-cms.f-static.net/uploads/4391602/normal_60634d57ed81a.pdf
    • https://cdn-cms.f-static.net/uploads/4445125/normal_6041c88d9c3fa.pdf
    • https://pikimitif.weebly.com/uploads/1/3/3/9/133997727/wubiki_noregokesa.pdf
    • https://nuridofif.weebly.com/uploads/1/3/4/2/134234753/a2ac7a1e0290c08.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nagomax.pbworks.com/f/revekom.pdf
    • http://gatasulupu.pbworks.com/w/file/fetch/144411960/how_to_clean_vicks_vaporizer.pdf
    • http://xujefix.pbworks.com/f/90939678384.pdf
    • http://tagexoba.pbworks.com/w/file/fetch/144422652/tojigewujagajij.pdf
    • http://mudowomuxexo.pbworks.com/f/af_sosyal_bilimlerde_aratrma_yntemleri_ders_notlar.pdf
    • https://uploads.strikinglycdn.com/files/a4f58a86-2fbe-40dc-9d6a-f738466814d1/fakaguvezitawib.pdf
    • https://uploads.strikinglycdn.com/files/debc5e34-9c23-41db-ae41-6bd606fe880c/geslutin_de_200_mg_para_que_sirve.pdf
    • https://uploads.strikinglycdn.com/files/720800cd-1621-4178-88dd-8365156b8097/redhead_safe_change_combination.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f62a.bin
314103c63d7c2be73788c10367fd8fc9d5c7ad79eb5526e91c6b7a26a97a3a29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 5296 bytes
font_01_sfnt_off0001080a.bin
bd59f6778c5ea54ab93bf12f8931d71281ce3ff40c1dc5fd0b3a20b26802eaec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 10956 bytes

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