Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8a93ac89ae3036…

MALICIOUS

PDF

93.4 KB Created: 2021-09-18 23:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ac0b333e1e005f75802921a8caf5afb SHA-1: 340f61339d999389fc4b844daf61219e6e317f1e SHA-256: fc8a93ac89ae30360a79d927f3c3ea0be2e997714e337dcaacc0437e9653176e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple engines, including ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=ppsspp+games+ps2 PDF link annotation
    • https://rimi.sk/userfiles/file/39221809588.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210907141101.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/31543591957.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161418548b08e7---dasosirapinupadofemik.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/21f4b6b01254f8bf6ad6c8a975b1da24/kiwesibufusim.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/pekawowenadutupoxedilaka.pdfIn PDF document text
    • http://baoveantam.org/upload/files/82565961967.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/11306497478.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/zawawusegubadofo.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/47817664829.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/3243816389.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/60515791203.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/sateden.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/segelo.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/21462675543.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/68741636950.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/2160760781.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/pamizabirapilimex.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/02bdb783b6faed5e942045f52d62a4af.pdfIn PDF document text
    • https://netlandschool.cl/files/rotigagejuni.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/63026619439.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_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001204b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204B 18820 bytes
SHA-256: 611ceb9f41677fe23713216086c99bb4a4310cab8d8aa773e264be8b086a7ac8
font_02_sfnt_off0001515f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515F 10156 bytes
SHA-256: 654da67318faf381962d2a5a3260515aa34d433ca4e47301c722c28fbc90dbc6

Open this report in the interactive analyzer, or submit your own file for analysis.