Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc97a6e8fa7980c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 23:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c0d1f0844b60a66ecd50a0dad99ca17 SHA-1: 2f6a6f743ee627716a1b25a604145b6f3ee10aee SHA-256: 7fc97a6e8fa7980cc8c7a20ee4e2891a712435ccb54d1b80b3de86fe14f94ad4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, with numerous embedded URLs pointing to other PDF files. This suggests a phishing or content distribution scheme, possibly for SEO manipulation or to host further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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 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://keluargamimpi.com/contents/files/54158445009.pdf In PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/dcf38766e9c1a70ebf456ff43a3bac9e/zelenonev.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/vikudubakosoji.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/48335dcdf770989812217ca965767302/28684848780.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/kiwazizuzipunizafusobubev.pdfIn PDF document text
    • https://hgb.se/filer/file/towowa.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/39920762644.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/rezumelu.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/leropajeso.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/nisolilovapetej.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/76920236688.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/13823164137.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7bee8640d---xiwagutaxazasisulitera.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/nirumenovalutef.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/lugawotirara.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/xigagubajifesi.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/dudatifufiga.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/mavij.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zixorazilorulimenivo.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/80664642505.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/nolizizopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+phone+sales+by+modelPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 10792 bytes
SHA-256: c50248ef02b12f55c28c3a927adf0a9ece6d3b677ff2b585bce77fd8c592bcd2
font_01_sfnt_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_02_sfnt_off0001291f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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