Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8925bab37fb3829…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 10:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 556c2772ea114708ae4a310c0b591a32 SHA-1: d9f2fc0f605e24380bd9159c54ecb73194f4e5e6 SHA-256: b8925bab37fb38292cd899de34fa37706f1c4d059bb8760c6c9d8a7e1317a1af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

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://samtekelektrik.com/files/52701972991.pdf In PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/fodiruxufoda.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/wamepefunuvegozamate.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/dagegovetotamuwomo.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/29879147332.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/vijadudexaxugopepig.pdfIn PDF document text
    • https://pmms-online.com/assets/file/71532708467.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/27616270331.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/92575177105.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/44423882784.pdfIn PDF document text
    • http://sinners-party.de/media/file/dedisewo.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/39511422421.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148097db51f0---jijexidaruzure.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/batexepufo.pdfIn PDF document text
    • https://successalpha.team/upload/files/6934641471.pdfIn PDF document text
    • http://mdtrend.hu/files/file/rewarumulupu.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/65168292794.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135d27cbd280---kuruzafun.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce09a3680f---49225691090.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109062154019766.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210919_222637.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/xepufixunadojotosadi.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/zevikof.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/kazasamuxalabu.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/filofazuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=xd+android+templatePDF 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_off0000dacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 17112 bytes
SHA-256: dfdb98bdea4559e987de6982bfb5bf792e0b11ea5a665cebc09eae01e3074160
font_01_sfnt_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 10392 bytes
SHA-256: 0906f14a787e24d7d95619883ade6f68d7818e6fd6c80660edb6d92caa1911e6