Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ee44d97bf18906…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 21:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d81fc62d9609814be7dea30cf4aeeb7b SHA-1: 2a98121b1aff6cd4d51e382b3f89d318d613d144 SHA-256: f7ee44d97bf18906f986c7bae4407d0f293ebad3a8a262ff89bb9c47a113cb0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for distributing malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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=battery+saver+app+for+android+free+download PDF link annotation
    • http://w-mill.jp/images/file/wezozijawerulugo.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/vafovawijixeru.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/nitexufokuzudobifokod.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/68374378432.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/fefaxuzojezizasuv.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/081211441415.pdfIn PDF document text
    • https://heyratacademy.ir/file/73023145206.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/guvuvogabenenojepamegal.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/zuzobarusalen.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/97871336104.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/054762d572ba387eebb50957d647a710/vedenavojobota.pdfIn PDF document text
    • http://myphamasia.net/upload/files/boposuwavutobo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0de4059ae---85014859469.pdfIn PDF document text
    • https://svltv.in/userfiles/files/55378934219.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/pizazaman.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/vujil.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/99228035293.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/52333460492.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/55202784906.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/pefevozubutogibuludon.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/20037252972.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/litudov.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/37836400825.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/96358425412.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/4364077021.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/96901999997.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_off0000c937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 10812 bytes
SHA-256: 64fe97681f2cd5109c5ded5587d94e5e7a0c08ecf337be4a48dbc32c0882ddd9
font_01_sfnt_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 17876 bytes
SHA-256: 616419eeeb4e70ddd2b505d7aec27d27c35cad57de429b9b5a80c5ecddf11456
font_02_sfnt_off000110da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1