Malicious PDF — malware analysis report

Static analysis result for SHA-256 928d09dd47be773f…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 23:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f15994e3646c754ca35453726d3c9aae SHA-1: 356e837898c4c386a0a44f68086fa5e5f0b52ca0 SHA-256: 928d09dd47be773fe69801628aad6407faf78c5cbda284a5f4e26ae53ab09ce3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, many of which are likely disposable, suggesting a phishing or scam attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to distribute malicious links across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b1379dce59d788940fd5cbfbae5c71a4/movalonoxujafalo.pdf In PDF document text
    • http://sineadstone.com/userfiles/file/navejomefo.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/wofinara.pdfIn PDF document text
    • http://sdds.be/userfiles/file/dojatenabekuwanedize.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/6306161303.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/94236071175.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/xadagitajakakutim.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/lepebuzagunabefukuwokopid.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/38354670349.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/75682460799.pdfIn PDF document text
    • http://gekon.net/userfiles/file/pitatobuletadufobedup.pdfIn PDF document text
    • http://itena.si/uporabnik/file/luriv.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/81530791249.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/87768237860.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/24446547875.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/74122577300.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d18a4619a0---38787436313.pdfIn PDF document text
    • http://zimmerei-possert.at/92996883548.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/68245848752.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/rivanabe.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/16584073800.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/fojozarafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=adblock+do+chrome+androidPDF 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_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 10584 bytes
SHA-256: 3b31ebf6c84def71e87107120cf57c31f01dceb41f665af96721716a3ca250b1
font_02_sfnt_off00011559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11559 19988 bytes
SHA-256: 948b29925b07d502b905591e99bbc90825920d27883ba866ef5851fa482732c9

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