Malicious PDF — malware analysis report

Static analysis result for SHA-256 287f48fce1c2f983…

MALICIOUS

PDF

85.7 KB Created: 2021-01-24 14:34:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e809c16fd5e4ff017ffe0ee23357328b SHA-1: 297f7f123fd369812f49f32c5f59b6e0aaa76445 SHA-256: 287f48fce1c2f983f6b2906eea95acec194d5cbe136dbe2876aa203eb7a4771b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO spam or to direct users to malicious sites. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to manipulate search engine rankings or to phish users by directing them to numerous external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://maypoin.ru/123?utm_term=eye+of+cthulhu+terraria+master PDF link annotation
    • http://rejilif.iblogger.org/graphing_two_points_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473902/normal_5ff33cc800850.pdfIn PDF document text
    • http://alifan.store/zaxunagosubewokedosuv1wfb.pdfIn PDF document text
    • https://jimekijan.weebly.com/uploads/1/3/2/8/132815057/wefotawoma-xekoz-wabuw-kinuzidadamiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420766/normal_5ff800abc1f2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366398/normal_5ff9da64ac745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370560/normal_5ff76be160e1d.pdfIn PDF document text
    • https://doxizuzipoleri.weebly.com/uploads/1/3/5/3/135323895/fobexemalijep.pdfIn PDF document text
    • http://rimka.xyz/runipijutukikuzugajivodp16r3.pdfIn PDF document text
    • https://tifutijije.weebly.com/uploads/1/3/2/6/132682998/pegumagekexejub_vatadinitidadav_rudaroledame_linojarezuvilif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464739/normal_5fde4f5a98dd6.pdfIn PDF document text
    • http://trujillostacoshop.com/world_war_heroes_ww2_fps_apk_obbzo108.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/wafogimey65ig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xekibedeba.rf.gd/funijasuj.pdfIn PDF document text
    • http://taxisariwoboduz.epizy.com/16_gauge_to_mm_sheet.pdfIn PDF document text
    • http://gadoxijumulop.epizy.com/reflexive_banach_space.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
    • 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_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 5180 bytes
SHA-256: 8cef628486de7f4356b103bf760dd16123a2b768942fddf4523f0515efba7a1f
font_01_sfnt_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 10740 bytes
SHA-256: 510a5fb3d1baa01ae8a1ff05c2ad8628d80bd655cbf7c29327571d3d59241ad4
font_02_sfnt_off000134c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C2 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550

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