Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf0cfdd7d1b878b…

MALICIOUS

PDF

71.6 KB Created: 2021-09-19 04:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8da3f6fbcd38d7ba6ed913dfcd6b5cd SHA-1: 2dbdd5dd0ed3c3ae7bb6a10822ab2fbb07b778da SHA-256: acf0cfdd7d1b878b2ed78825b373d2082815304794b28321220e3dbf592af2c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/43422989807.pdf In PDF document text
    • https://sitycare.com/FCK-UserFiles/files/mexuxuvumexasutikakalad.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/xonemidoxujodekodekufe.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/88084211993.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/27780046380.pdfIn PDF document text
    • http://hkacca.com/userfiles/12788331381.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/dizedeki.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/99139952238.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/zixoxojodaruluduvugit.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/59c82ec7dbc670eb1ee36475d032b0db/megikiba.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202192124824032.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/81759822631.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/winivitelawiwuf.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/77895687982.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/xonulek.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/vuvonan.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/37111201272.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/26200486349.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/xexuvetexetazidupava.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/80933722273.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/3968833235.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332bb1d0ad3---gekave.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/62909526892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=house+on+haunted+hill+1999+onlinePDF 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_off0000b6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EE 16120 bytes
SHA-256: 210ef1807ab8ad5985e77f1688649810ba0cd387d592b44d8c05aebb33bf7a15
font_01_sfnt_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 10556 bytes
SHA-256: 71d1f903594bda07a9e8b7dfef2a3535ea44b8e07d31ef04a7510531ed1c957d
font_02_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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