Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b7c377b5bedae0…

MALICIOUS

PDF

73.2 KB Created: 2021-06-01 08:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 435a223a20928900a0a78dc65ead2ffa SHA-1: 7de01617fef3c38e6821b94191a1bcea7f9e92bb SHA-256: e5b7c377b5bedae0005037efda2d8bb4216618ec921e2a7c3e68751b425b717b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malware or phish users. The document body, though heavily obfuscated, appears to be a lure related to weight loss measurements, which is a common theme for phishing and scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/pbw?utm_term=how+to+body+measurements+for+weight+loss PDF link annotation
    • https://fupobemoxu.weebly.com/uploads/1/3/4/6/134669325/gibegivuwafoza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462350/normal_6005c97605785.pdfIn PDF document text
    • https://bunivuwavimi.weebly.com/uploads/1/3/4/7/134706582/gepoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415951/normal_600a1275e81da.pdfIn PDF document text
    • https://goxesepejapumew.weebly.com/uploads/1/3/4/6/134609979/vikewevivixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467979/normal_6044fddfabd67.pdfIn PDF document text
    • https://wowajonaj.weebly.com/uploads/1/3/4/7/134717857/6af1cc4984fc5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nefusim.pbworks.com/w/file/fetch/144443859/php_programming_notes_download.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/rna_transcription_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41194abf-ee74-48ae-9bb4-61b501cb412c/how_to_reset_a_kenmore_oasis_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37bcc3f2-36e5-42f3-83f3-8fc30120ecd5/libugoxijujinasililef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a1e156-022f-4eb0-9da8-4e24087de357/xifijurumamiwumered.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac92351f-4b1c-4087-9d11-e3497668f9a1/70822883296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4e8090-e812-4b59-b81d-212063ffe465/96307179228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4daa3f4-0151-49cf-9c4b-795d9ac025b1/is_omron_intellisense_accurate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9eaa3c3-00b2-467e-b708-64a693491697/1554025025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8940d292-d1d7-47fe-97c5-47989be6e0e1/que_son_las_arras_del_espritu_santo.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144445074/35083726230.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 5616 bytes
SHA-256: 05291f7785ea775877a7cab205139361340364af4ca5a49b13925970e4192f61
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 10112 bytes
SHA-256: 68707c3e2f2fc80748c22c8e620c6c18f9b8cdd9fd3badf2c809aa698176dc44

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