Malicious PDF — malware analysis report

Static analysis result for SHA-256 103b00bae67ace4c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-23 09:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b10183349d6e30345bc49740fadb65e SHA-1: 8e514551da54b63e19a2b9a1fee2152ef01c7935 SHA-256: 103b00bae67ace4c2ad130c0368e5996288567ae3c15f621c1242524bdf50334
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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://allytemp.ru/uplcv?utm_term=super+mario+collection+snes+rom PDF link annotation
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/wiwaretoderatufugafodojab.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/folemevosupivofezamo.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/12585949154.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/53914734028.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/kepafejimaxakixuwezoditit.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/73225215049.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/nozozererilel.pdfIn PDF document text
    • http://i-physiology.ru/upload/mexitudiladigazawov.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/58642686231.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/64587531927.pdfIn PDF document text
    • https://path.mn/userfiles/files/14312327370.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/kobal.pdfIn PDF document text
    • http://darec.sk/files/files/tenojejugodorutimedig.pdfIn PDF document text
    • http://sadvita.lt/pav/file/bomewofiragodoriputili.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/43466055298.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/70503085196.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/23776917726.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/1613979291.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/44899554913.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/leporulo.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/81458981179.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/0bo3r91u6sngu72fpntareri9v/7311247647.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/39257824148.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rc7a0788bbdabsbb8h6f6isk9q/49109536160.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/wajuvowemifusamamogamoj.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://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_off0000e5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E0 17716 bytes
SHA-256: 98d391d0285f0a8376f65dabe95d47ec5ae586d8ac53f3e6950577e44984d422
font_01_sfnt_off000113bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD4 10712 bytes
SHA-256: 33e381a0131304b80dfe532a2a8ceed42b052daeb908196245c35f42305f57dc