Malicious PDF — malware analysis report

Static analysis result for SHA-256 1549b7f78dc7b6f2…

MALICIOUS

PDF

75.3 KB Created: 2021-03-14 11:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1e324ff4a9a47b34feaee32c406a1470 SHA-1: c23361a6dedf53a0326215d693bc2ac73dae6149 SHA-256: 1549b7f78dc7b6f2a5e1d987f6280246d1b46f9e7ac27faee3e90a65c4c06dfe
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/wix?keyword=oskaloosa+high+school+softball PDF link annotation
    • http://frasqen.online/lamazijowaxatipogafagigjvh3g.pdfIn PDF document text
    • https://cdn.sqhk.co/guvawatuzax/hq2hejj/aimpoint_pro_review_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/ninilevikod/hgjEjjf/chevy_cruze_diesel_manual_transmission.pdfIn PDF document text
    • https://cdn.sqhk.co/tamenotu/fj0aTjg/38771149581.pdfIn PDF document text
    • http://kokilubowo.22web.org/matogib.pdfIn PDF document text
    • https://sufosuzupunu.weebly.com/uploads/1/3/1/3/131379650/9608733.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/MnhbRaL/smashing_pumpkins_tonight_tonight_bass_tab.pdfIn PDF document text
    • https://cdn.sqhk.co/bunigenozav/dYghcn5/jelly_youtube_subscriber_count_live.pdfIn PDF document text
    • http://sandwichhq.club/jupotozopomugukonemokaxvrtr.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/SpifNgh/tinanexifil.pdfIn PDF document text
    • https://betamomaj.weebly.com/uploads/1/3/2/6/132695924/7610348.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/jhiiNgi/43239292266.pdfIn PDF document text
    • http://urologo.store/how_to_get_a_religious_exemption_for_vaccinesy5b3i.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/gjLGiam/kepazalawatimipudavadimow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_9a3286ca42b84340adbc9ab2fbbac08a.pdf?index=trueIn PDF document text
    • http://fizaveloxuraje.rf.gd/plan_de_estudios_2011_quinto_grado_espaol.pdfIn PDF document text
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_57e7bbbb846440d6a86f873f2170f48d.pdf?index=trueIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_2633097801284fd9a0b0521a8fa3da80.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 5276 bytes
SHA-256: d9b50d6cbdaf5ecdb49402f1c48fe0eb7ae0f0bcbbe69c1b12af58e6346c0334
font_01_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 10968 bytes
SHA-256: 01be7e9d9bfcb14c9dcbc518d8ed56803d387563198014477a989d7c45647289

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