Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d291ab3b576d9f…

MALICIOUS

PDF

74.4 KB Created: 2021-09-29 09:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ced545b157aa2ea0cc78bb2d4f1d5e56 SHA-1: 343cd8231c47463f4b4e4bd95942411aaef911c6 SHA-256: f7d291ab3b576d9fe2064bab6d4da831d4b69c32cb74c782f94fb795ac88c249
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern focused on redirecting users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://vizugy.hu/uploads/files/files/66418621605.pdf In PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/41255047957.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/karixoj.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/lezegevifoj.pdfIn PDF document text
    • http://elskenecologie.nl/files/veburepabanipevix.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/b67c493f957c4c5f99e50ccc864d38bf/64378106903.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/43800693072.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210914065623.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/15457432592.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/81500892715.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/vojulazidigiporu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/080837565322.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/japalasikezilufapagutagun.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/61047906808.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/zewamewura.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/7347139969.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/karebexovewawifa.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/nufezasunosonazadam.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/94904704602.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/26073080892.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/25749247274.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210909_70A6493E3FEB611E.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/zetimuligaxenos.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446fa686587---gepumanapalutuwizefenum.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/23815690410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tvtap+pro+2021+apkPDF 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_off0000b824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD036 20400 bytes
SHA-256: a6cc87af1551137ed5eb93d427e26a2e7099252f2d699bc5d1e0bd6698ca6ade
font_02_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 10116 bytes
SHA-256: e4da706c1c39dcb456d4dc8e228d35507d502a4dbc9f4977905ff789dc4ffdbd