Malicious PDF — malware analysis report

Static analysis result for SHA-256 adaf9655bd016ba0…

MALICIOUS

PDF

84.6 KB Created: 2021-03-24 12:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a38561ba895fa967dfeb3f1a6e2cfd03 SHA-1: d0b525d93a4d387bd25f463205ef945d4abdd1ea SHA-256: adaf9655bd016ba08cb4730eacdc25e6b6a42e09ce4fb1daa386ef51ea5d3843
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm designed to host malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=balogh+b%25C3%25A9la+k%25C3%25B6nyvek+pdf
    • http://lefefegibilapo.22web.org/how_to_start_to_learn_calligraphy.pdf
    • https://cdn-cms.f-static.net/uploads/4421611/normal_603d98031eb6b.pdf
    • https://cdn-cms.f-static.net/uploads/4380707/normal_60217f7cd09e7.pdf
    • https://cdn-cms.f-static.net/uploads/4425501/normal_6028348b2d846.pdf
    • http://disaxoxejegip.22web.org/how_to_speed_up_tp_link_powerline.pdf
    • https://static.s123-cdn-static.com/uploads/4425491/normal_5ff47cd7451fd.pdf
    • http://watomidipokaki.22web.org/duvotakagug.pdf
    • http://xupevagadozojad.22web.org/muretigizama.pdf
    • https://nunokewapi.weebly.com/uploads/1/3/5/9/135961733/ketewamoxomedap-wikafosax-sigatesid-rimiti.pdf
    • https://wowujisalot.weebly.com/uploads/1/3/4/3/134349860/a9385eb8b7f6.pdf
    • https://cdn-cms.f-static.net/uploads/4424683/normal_6054fea0c9e5b.pdf
    • https://cdn-cms.f-static.net/uploads/4460060/normal_604e9707bc57f.pdf
    • https://cdn-cms.f-static.net/uploads/4422392/normal_60508de274fa1.pdf
    • https://cdn-cms.f-static.net/uploads/4498404/normal_6058bef0a9fcc.pdf
    • https://cdn-cms.f-static.net/uploads/4418565/normal_5fd9d31f30d55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_2e70bddc079d4e578cca22cac3e73b2e.pdf?index=true
    • http://rozazidugo.epizy.com/wotemawobep.pdf
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_4c9998f453174be486c81479631b7c84.pdf?index=true
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_22e3ad588d2d49e79beb267ed3dfc5c4.pdf?index=true
    • https://3f3b26af-a357-4ab7-b723-baa2d0f6bb2b.filesusr.com/ugd/5d6e2e_a6d6d9c16cfe45a69693ecfe28b73a86.pdf?index=true
    • 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_off00010739.bin
2908bafe1399f9a8ccdc9c6614e2e9bf24bac9721f2525a1937554c28ccd7de0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 5724 bytes
font_01_sfnt_off00011a3e.bin
39d02e54e8a01b00d15d34c0ebd7c29ae78111d336108017f15c61cf67f43945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 13428 bytes

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