Malicious PDF — malware analysis report

Static analysis result for SHA-256 7573391355c85a6e…

MALICIOUS

PDF

137.4 KB Created: 2021-04-14 09:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 565ca64acfe01c0bc77c884e19bd27c7 SHA-1: 72b71daa14aaeaefb405fd1282b53e9eaea319e6 SHA-256: 7573391355c85a6e140aff6a0a5006db90738a7ac5fc7da3baa07c58a435df5b
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of numerous external URLs and the nature of the heuristics point towards a malicious document likely intended to lure users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=the+chronicles+of+narnia+books+age+group PDF link annotation
    • http://rotawafuwuno.scienceontheweb.net/possessive_nouns_worksheet.pdfIn PDF document text
    • https://rirakivu.weebly.com/uploads/1/3/5/3/135333056/dokuzu-sufewewolabufa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476954/normal_5ff095f6ce725.pdfIn PDF document text
    • https://filinisosiwox.weebly.com/uploads/1/3/0/8/130814007/rudenumunozewikiguw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_602d01df9bbae.pdfIn PDF document text
    • https://medotufise.weebly.com/uploads/1/3/4/5/134512565/7995887.pdfIn PDF document text
    • https://befukifesili.weebly.com/uploads/1/3/1/4/131453358/83128.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/ruzepigoxerajenuzo.pdfIn PDF document text
    • https://kawuruli.weebly.com/uploads/1/3/0/8/130814241/65785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_603e50790aac0.pdfIn PDF document text
    • https://rixukofet.weebly.com/uploads/1/3/4/1/134108779/tivaxavuweg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5fe9e09d34a66.pdfIn PDF document text
    • https://xakalawuvobovu.weebly.com/uploads/1/3/1/0/131071286/fotaraku-tinojodo-pamogopitebeluv.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/bowizuputalobudiza.pdfIn PDF document text
    • http://datovufes.scienceontheweb.net/99912419613.pdfIn PDF document text
    • https://xukusoresi.weebly.com/uploads/1/3/4/4/134488105/17e941944f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465565/normal_5ff54d13de2ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_ab66e14d7cdb458bb60146600092e913.pdf?index=trueIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_623f64477288409ea83d43bcc4ca742c.pdf?index=trueIn PDF document text
    • http://segurixuzek.myartsonline.com/legaxepejitujak.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_3a3b2045e16946fa8b5cbfd05597e156.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2DA 5232 bytes
SHA-256: ad4686f630fe3b087729d2e1caae41e89da413f9ce8044ddca33921b46c57348
font_01_sfnt_off0001e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E495 11180 bytes
SHA-256: 5680023318f425c976170877ffb2d1d5aa273e306c0a9fe953ee76fe699342ed
font_02_sfnt_off00020a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A6C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378