Malicious PDF — malware analysis report

Static analysis result for SHA-256 b936d782ea2d7980…

MALICIOUS

PDF

87.1 KB Created: 2021-03-28 19:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6d93f12e85be0795a952fb0e7cdd7c37 SHA-1: 187e50913db7d2bb8db9279d1bb8a70f4f1a39e1 SHA-256: b936d782ea2d7980b04fba2ff6d8fab1da45b76918196cb0443309bc02258fff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

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://jumiwimov.ru/strik?utm_term=troy+bilt+pony+riding+mower+deck+belt+diagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451227/normal_605cd5aa24767.pdfIn PDF document text
    • http://nuzalozipofeven.22web.org/warixuxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452217/normal_6005c0317300e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464542/normal_60521b0867fff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vasofirida/converting_fractions_to_decimals_worksheets_8th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29deb4ff-9dae-438f-9a0e-eaadb1284448/lematovunelogazitarodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141e2315-6716-4fb3-9501-637a7bae5627/civilization_6_gathering_storm_deity_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fa2278c-5c36-4152-9361-dc57d8f659c3/how_to_use_kill_a_watt_meter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4a6340-466e-4b54-922e-94998ee39096/4813202331.pdfIn PDF document text
    • http://divepirat.epizy.com/puruwafuguvavodedovaberi.pdfIn PDF document text
    • http://mivazofirogo.epizy.com/linksys_ea4500_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/il_dcfs_mandated_reporter.pdfIn PDF document text
    • http://liwumakagizir.rf.gd/zomipukex.pdfIn PDF document text
    • http://tuwemajufa.rf.gd/carbohydrates_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192f5539-285e-41cf-b742-1831328dfbe1/9432092916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93cd239c-739e-4088-98ea-fbf9a98c0111/bapolaxikixaveparut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/244ac8d6-1204-4bc7-be5c-f19f9fe3c9f4/critics_review_of_a_streetcar_named_desire_play.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/how_to_test_covid_vaccine_effectiveness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d22d593f-d8ab-4574-b8a6-ab1ec36ab05e/area_of_similar_figures_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90b8e21-e532-4d48-ab9d-90b1c261412b/22416052526.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/buxewodugokedajemawefosox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a795266-6b30-4a54-b2e0-0c0b2042193c/how_long_do_u_stay_in_jail_in_monopoly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ce2017b-33c4-4f9a-ae8e-0a47cd42395b/2016_kenworth_t880_service_manual.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 5564 bytes
SHA-256: c2ee6cc7fb2b50bdc0b21da19cb21ced9534993cb88d53ee4ff75c433597d90e
font_01_sfnt_off00012847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12847 11312 bytes
SHA-256: c2cb43724f3263b7bc6b49b0177267a9d771fe70cb5f08368bd2a514203343e0