Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb65121bf28f925…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 06:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 244f81eaeb6993bd2eb7a7a92680983a SHA-1: 3fc02e9095144e344e185751801c5d879631e3f0 SHA-256: 1fb65121bf28f925a1947f12a28074e464ecf403ff10bcb16795b52ee675f055
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are identified as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using multiple distinct, disposable hosts to host a large number of links, a common tactic in phishing and scam operations.

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 http://associazionemillesogni.it/userfiles/files/rizadoxom.pdf In PDF document text
    • http://ecolservizinettuno.com/userfiles/files/62591276373.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/fejavuxunigunugizimij.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/19919045513.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/fetetisesop.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/51345465293.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/jukezugepije.pdfIn PDF document text
    • https://avflash.nl/upload/files/sosoxemafonivilibegi.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/zizekejisodurasaxoga.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109011710322253.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/bokokinijibitegemejuma.pdfIn PDF document text
    • http://annabarons.lv/files/files/jofor.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/buzuzavi.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/wobufumisapalezofu.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/fuxogewizepewa.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/guxanuserobini.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pigigibisimatizuzopo.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-1/20210901213111559142.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/kejolepirexanevax.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/vilal.pdfIn PDF document text
    • http://sinostandards.net/upload/files/sasuwovenidogikamuxesaka.pdfIn PDF document text
    • http://geoman.cz/data/file/11536636668.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/93976399783.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/wusokevepemedadef.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/6876383256132d844d653b.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=no+data+symbol+on+androidPDF link annotation
    • 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_off0000deef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 17444 bytes
SHA-256: c7b91a267fedc922bfd4c6a5d0a374699897cfca2d8466cf0d7d13a8f276ac2a
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 10508 bytes
SHA-256: e846ecef98fc8e3e8b77d287e8370d1f5fd54d9410487cd5d0d472f9b1ca3f6c
font_02_sfnt_off0001248e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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