Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a26820964085517…

MALICIOUS

PDF

75.8 KB Created: 2021-01-31 03:19:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3522bcd4381bb68201dbadc5edc2cdac SHA-1: 2ffa4762467fe0023f850ff1699e7f87af8873b0 SHA-256: 1a268209640855177e2694772984a6658aa9a6e5ed3f4c98ef8ba4b9ee1feb8b
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, appears to be a lure related to a technical book, aligning with the PDF_SEO_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=o%2527reilly+-+css+the+definitive+guide+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4391915/normal_5ffa4e6a54e4e.pdfIn PDF document text
    • http://talobaniwi.iblogger.org/chess_apk_for_android_2._3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459922/normal_6007e3849e590.pdfIn PDF document text
    • https://rezopagukivuru.weebly.com/uploads/1/3/5/3/135307961/3d515c27dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_5fdc15cb38fa8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413008/normal_5ff21e4d1f59a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482188/normal_5ffcfe3b3a7a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449992/normal_600219a692b66.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://s3.amazonaws.com/zarusegibitumet/buvujerefonixiv.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/witidepuzomu.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/kuguvo.pdfIn PDF document text
    • http://tozuduxaxikagik.rf.gd/xirefopadevixomaxorixan.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/digon.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/50541772382.pdfIn PDF document text
    • http://supetok.rf.gd/phpoffice_phpspreadsheet_reader_csv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 5232 bytes
SHA-256: 25da1739b8e2063cda84217a50a129fe5564fb4e144e1070ad78c7015fee9446
font_01_sfnt_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 10692 bytes
SHA-256: beb1ec54d8bf068e2e786521e79886615c50ecb69fc46a26b3d04e01653db349
font_02_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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