Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45cd1b272177f9d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-25 20:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f27905a0951e2a3a4819e882f43bd66d SHA-1: 70915bbd6bd9913517da32646ee834db6ab2916a SHA-256: f45cd1b272177f9de8b6de37fd239611181293a24917415f4e3fe802bef0621e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this behavior, with many distinct hosts and UTM parameters used to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pure-chiral.com/upload/files/xebokipesorizaseza.pdf In PDF document text
    • http://gocoachfox.com/userfiles/file/lazamigoxesoponut.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/tuxukonuroluwiki.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/5237249364.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210911005013.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613452046f47a---15007183740.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/16639311287.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/99663122693.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/zaniladepananipajepon.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/88545597366.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/99239282510.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/41119746186.pdfIn PDF document text
    • http://marketingnews.fr/images/file/83367716490.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/60971699785.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/jixosunike.pdfIn PDF document text
    • http://skupka23.ru/upload/m/92350809481.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210924_A778BCF59E180C60.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/54545773348.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/58373065656.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/linizezelesosidofinojasog.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/62992874177.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/23898490415.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/wisoxata.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/bivorivewebapesuwo.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/kozunoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=heart+copy+and+paste+artPDF 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_off0000c95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95C 10476 bytes
SHA-256: 33e6cb3b66069b3c98f0cdf0490bcfa67628dd85d0fa6a76583bb1b2ec5c7def
font_01_sfnt_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 21072 bytes
SHA-256: 17069194f571727be55afc969ddd75c47be1d3ecd848e8ce148e53e7394b731e