Malicious PDF — malware analysis report

Static analysis result for SHA-256 2283954ef52c130b…

MALICIOUS

PDF

87.7 KB Created: 2021-03-20 02:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f94dff9e6ef2361bacbcac521ac5ca9e SHA-1: dd8c422f37b7d9597985309e09f65761156a71e4 SHA-256: 2283954ef52c130b0583ca77e44251e9912ef9a4ee002cd6e98618d118281450
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, suggesting a phishing or SEO spam campaign. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leading to further compromise or information theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=lenovo+t420+cmos+battery+replacement
    • https://cdn.sqhk.co/pumevigatare/esB9Ngd/78864133751.pdf
    • https://gokaveruziniva.weebly.com/uploads/1/3/4/5/134580144/netowanopivoli-jixuwidejejema-titosoga.pdf
    • https://pulaberiboz.weebly.com/uploads/1/3/0/7/130775840/toxatixutarugove.pdf
    • http://lomigakorak.getenjoyment.net/94560306180.pdf
    • https://zuzefeza.weebly.com/uploads/1/3/1/3/131397950/tijojewoje.pdf
    • http://tututot.mygamesonline.org/hodgdon_reloading_book_2020.pdf
    • https://fejisamuzek.weebly.com/uploads/1/3/4/6/134636520/fadutex.pdf
    • https://cdn.sqhk.co/womafafowix/hesqFTz/funozosefuj.pdf
    • https://lumuvimusu.weebly.com/uploads/1/3/4/7/134719948/dozapijuwa-nexixe-menejoroje.pdf
    • https://xefozevinunakab.weebly.com/uploads/1/3/4/3/134340699/4584863.pdf
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/sadelosudasi_xudelerat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fd1e806b-3610-4d38-a05c-e4c0d950df1d/kenmore_dishwasher_model_587_specifications.pdf
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_5fb920fa17874e138be142f2ff5f69a7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c484b122-b585-43c9-b9c3-049ea46925ef/57451794765.pdf
    • http://gutekuretejapoj.onlinewebshop.net/all_chemistry_formulas_download.pdf
    • http://xawiwevivuzox.onlinewebshop.net/rupevomejegutinobif.pdf
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_65bad62c90b94c5aa30ddf6a19ba1715.pdf?index=true
    • http://dupepoge.onlinewebshop.net/23129421583.pdf
    • https://uploads.strikinglycdn.com/files/ecee7e35-ef63-47ca-aab3-d5e3b3dd1867/popaziv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ba1.bin
df191fe7ae35e27042d0ad6ad9abe258e43c8ecd66aab0fbdb96e2fe8d86ca8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 5424 bytes
font_01_sfnt_off00011e03.bin
561c08352e11f2f0dbac1f4ae63c7f5fdb64b2af197620345862c090182f4641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 10980 bytes
font_02_sfnt_off0001435c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1435C 4324 bytes

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