Malicious PDF — malware analysis report

Static analysis result for SHA-256 d705b4df9e9e1839…

MALICIOUS

PDF

73.1 KB Created: 2020-11-20 21:56:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 285215facb020fd468d931ebd686f41a SHA-1: 5a42085d7ed6a41b5d483f310a7adde00b30700d SHA-256: d705b4df9e9e1839624adde23e9c8c10655c4f1e277ae7c6716a172ebc02921b
156 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating it's designed to host numerous external links. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score strongly suggest malicious intent. The document body, though truncated and obfuscated, contains keywords like 'Dutch bros secret menu' and references to 'roblox hack', likely serving as lures to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/123?utm_term=dutch+bros+secret+menu
    • https://vadazexo.weebly.com/uploads/1/3/4/6/134646317/4234440.pdf
    • https://bunemanedadon.weebly.com/uploads/1/3/4/4/134476229/sidemogoxuxo.pdf
    • https://cdn-cms.f-static.net/uploads/4379489/normal_5f913a9ca15a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c024cd5c-7934-4a21-b0d4-e9ee3d4a503a/roblox_hack_v6_5.pdf
    • https://uploads.strikinglycdn.com/files/756596bc-b592-44a7-9996-f263259a09eb/the_secret_movie_free_download_in_english.pdf
    • https://uploads.strikinglycdn.com/files/4caf79f1-6ad7-43f8-bde0-317fb4275e4e/doom_4_classic_maps.pdf
    • https://s3.amazonaws.com/fujadabez/86231115981.pdf
    • https://s3.amazonaws.com/henghuili-files/ninamibapepababidavut.pdf
    • https://uploads.strikinglycdn.com/files/73e0876b-ccfa-4ec5-b817-e6076fdb662e/98043539059.pdf
    • https://s3.amazonaws.com/xukonakefules/hubspot_marketing_certification_answers_2018.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_off0000e07b.bin
81c8ead596d173a105194a06b6187dfad02c4d3a61d1287ab02dfd928585df84
pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 4936 bytes
font_01_sfnt_off0000f124.bin
7c5fcfb851e7f9e8882bac692f188d0ec81133633fcb26317f0b5420f306b80f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 11620 bytes