Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d8b483ada7432b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 01:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6386b018ee21db48798ec96e64a14db3 SHA-1: c213947b3d5ea2ba802871f933a25d54d80f0597 SHA-256: a7d8b483ada7432b489862028b7bbbf73a3e6f9228536c3932b483acc3f67a81
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicative of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggests a link farm designed to obscure the true destination, likely for phishing or malware distribution. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oilspecchem.com/files/18221894421.pdf In PDF document text
    • http://jonme.net/ckupload/files/webuteluxamigobis.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/1074843012.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/95950207041.pdfIn PDF document text
    • https://h016s5or78-du3.com/contents/files/jukine.pdfIn PDF document text
    • https://led7.ru/file/14395802664.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/vorasos.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/govut.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/83315332730.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/genoxegamo.pdfIn PDF document text
    • https://31app.com/userfiles/file/kujavolenakimujobofix.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/pavefapikorobudi.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/wosuxalodivo.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/dopiguxavu.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/rowosesimuxifu.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/fuvadutomine.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/wopavolekil.pdfIn PDF document text
    • https://timminsrenovations.ca/file/aKsGqNipRQroYJIn.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/jowixagejudanitawuwip.pdfIn PDF document text
    • https://datenglagi.com/contents/files/kedoxutoluruvexewaderemu.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/sinavimevewawilawuk.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/90362029092.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/kukuruwo.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/pipijefatijoterunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dns+android+7PDF 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_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 10016 bytes
SHA-256: 1cb0e77a663bb775fe1f6bd2b8e074511dc7fae4f229eaa2192c0824f40f1c2c
font_02_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 17616 bytes
SHA-256: 9cfe918f91e50dfaafdc9945aa585847fd5320ce16817b68e58b4aa5e1397e77

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