Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7af05c188904d3c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-19 07:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c78d59349a9f3468d86f3ab6f7bfedc6 SHA-1: 8644fa2ced0c4eab8c6586e5409d28a8481b5ee1 SHA-256: c7af05c188904d3c0800478b4705217324d38f6f7fd56d63638e0967b6463977
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various domains, likely to obscure the ultimate destination or to distribute malicious payloads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=ps+touch+apk+download+for+android PDF link annotation
    • http://tichdiem.surecare.vn/uploads/userfiles/file/kivituxawix.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/80925744541.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/fatikazikirodiweregefarin.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/48879036128.pdfIn PDF document text
    • http://packamate.com/userfiles/35022703757.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210919064637.pdfIn PDF document text
    • http://cocoal.com/uploads/file/95399619811.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/43945212991.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/kawiwazeguviw.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/20499906267.pdfIn PDF document text
    • http://vhktn.at/images/content/files/96335001664.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/92772243662.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/94658037094.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/foketojirewozeb.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/33482317645.pdfIn PDF document text
    • http://hengtongblower.com/d/files/9367504931.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/winuxiwewajubixituvowilem.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133256c9765d---kopafotakon.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/gunuzarefalurokuwopu.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/viwewufipadu.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/43852721898.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465d877387f---95860267960.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/52781921360.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/15304621471.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/9076265107.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_off0000c5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F8 10864 bytes
SHA-256: 8d443f441af6e2a102c58e87f81628ed6900e2315d47d4a8b13a483b4f174162
font_01_sfnt_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 16428 bytes
SHA-256: 954f192834a52ae3324716c04bdf6570cf9b8c160dd733c89f5a6dc949b7752d
font_02_sfnt_off00010930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1