Malicious PDF — malware analysis report

Static analysis result for SHA-256 4846b79a492158f7…

MALICIOUS

PDF

76.9 KB Created: 2021-04-01 18:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e62ec07d2cc3d53b809c86804216394 SHA-1: 0d4ddf848e84c5aae75b367ed81c42667d929ec3 SHA-256: 4846b79a492158f7bf3b69f96cfe4d5eb7a4b1e01b4c3c56163ecaeeddc6ee8b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a heuristic indicating a link farm with numerous external PDF links, and one of the embedded URLs, 'https://resalured.ru/wix?keyword=itube+pro+apk+2.5', is suspicious and likely leads to a phishing or malware distribution site. The document body, though heavily obfuscated, contains references to 'itube pro apk 2.5' and the authoring application 'wkhtmltopdf', suggesting a lure for potentially unwanted software or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=itube+pro+apk+2.5
    • https://sizezowupoje.weebly.com/uploads/1/3/4/7/134704467/lijuxu.pdf
    • https://jesepivop.weebly.com/uploads/1/3/1/4/131483445/46b1975814365.pdf
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/3e49db6fc8.pdf
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/gusebikoli.pdf
    • https://wipabobape.weebly.com/uploads/1/3/5/9/135985954/vusopunijonerarusaf.pdf
    • https://xasigebopij.weebly.com/uploads/1/3/0/7/130775268/mivebopexitejopurena.pdf
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/zogewapotogoz.pdf
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/7061480.pdf
    • https://kotafogora.weebly.com/uploads/1/3/4/3/134322717/1833823.pdf
    • http://sixesijilolun.mywebcommunity.org/83525797487.pdf
    • https://fivefijoxiwu.weebly.com/uploads/1/3/1/4/131453543/potip-pufof-dedikor.pdf
    • https://kadeborejegan.weebly.com/uploads/1/3/2/7/132740978/6263550.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b6eb9c41-a1f9-4ba9-bd7f-775ed85db482/sujaropalot.pdf
    • http://zejibanunepi.myartsonline.com/53409072879.pdf
    • https://uploads.strikinglycdn.com/files/ab398acb-686a-4b57-a72c-6b07817bc7bc/how_can_i_download_autocad_2018_free_trial.pdf
    • https://uploads.strikinglycdn.com/files/cde9ce37-5a7b-4ee3-9392-be4e82f1a615/94203069885.pdf
    • https://uploads.strikinglycdn.com/files/14ce72c9-20f9-45fb-8cb4-d9d2e9c6d2bf/jonalivakibuvumovusus.pdf
    • https://uploads.strikinglycdn.com/files/70d96399-768e-46ba-9d83-94a640545325/a_dolls_house_part_2_palo_alto_players.pdf
    • https://uploads.strikinglycdn.com/files/2692a51d-d811-44c3-87b9-a525422c8408/walmart_black_friday_2020_deals_for_days_sale_11_11.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_off0000f0d1.bin
fd8e799d09cbe2baf5fcd71e4f51fdc0f0177d9da592fb83f55449ece2b60404		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 5032 bytes
font_01_sfnt_off00010207.bin
54ebfa2c6c700defefda8e474d8f8fd1621f995d85f716e72c651d79dbf71c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 10708 bytes

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