Malicious PDF — malware analysis report

Static analysis result for SHA-256 0740e6d32d5696f7…

MALICIOUS

PDF

114.7 KB Created: 2021-03-23 01:47:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1d24b30d0ee973d7595eb93ebb5d41f SHA-1: daedc30a5ef1b98926015f49dab406434a5e4f16 SHA-256: 0740e6d32d5696f790ba26232e8818f9056d8c8fb365c4a865bf5c12059fd302
196 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 algorithmically generated and point to other PDFs, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://botokaw.ru/strik?utm_term=origin+and+development+of+indian+philosophy+pdf
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/xizekusi.pdf
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/42577efe8c2cf0.pdf
    • https://static.s123-cdn-static.com/uploads/4478438/normal_6006372fbd166.pdf
    • http://lnstagram-help-businesss.com/804451248317t9ty.pdf
    • http://tk-pobeda.site/echo_cs_490_chain_file_sizev8n0j.pdf
    • https://cdn-cms.f-static.net/uploads/4450039/normal_602438fcccf4b.pdf
    • http://creditscorefix.info/dubodolojuxemasotewowofaztejkc.pdf
    • https://cdn-cms.f-static.net/uploads/4420902/normal_6034ea3a76a7f.pdf
    • http://the-english-temple.com/38239117404j9vd4.pdf
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/ac684c4463.pdf
    • https://cdn-cms.f-static.net/uploads/4426410/normal_602ab713b21c3.pdf
    • https://bivedaniliged.weebly.com/uploads/1/3/4/7/134732971/mokiladulatire.pdf
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/8256085.pdf
    • https://static.s123-cdn-static.com/uploads/4451574/normal_6001d36c372e4.pdf
    • https://cdn-cms.f-static.net/uploads/4393345/normal_5fdc8ab38c294.pdf
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5fc6569f890b7.pdf
    • https://cdn-cms.f-static.net/uploads/4471488/normal_601090d344536.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e3fa7c29-d2c9-486a-b5ab-5f31a997b381.filesusr.com/ugd/c4dbd3_c2426b64a79d4f348ee582bc125ac594.pdf?index=true
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_ec7b12ff16664c79a59d2275c99a713e.pdf?index=true
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_6dc64e02d0db47888bf890ae02443ab0.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_off00017e23.bin
64848f84c2022bfd118c94c1a377dd8020a7cffb2584af31d699b5627975c15e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E23 5644 bytes
font_01_sfnt_off0001913b.bin
b12a056f980386e2cc4d06a08faef0a25ff8f5c4dc5ba2b383f0d5eb9787889b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1913B 13964 bytes

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