Malicious PDF — malware analysis report

Static analysis result for SHA-256 517897f445bbce39…

MALICIOUS

PDF

79.1 KB Created: 2021-03-24 04:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fa8e1eab929efd870e5bba26b2626b5b SHA-1: 9e828122b2383b60b2470adae0392a42e8802e1e SHA-256: 517897f445bbce39f769799f2aa5e2c365d66ca81abcdb6ca6a8cfba47b0da2a
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with at least two pointing to known malicious redirector infrastructure or disposable hosting. The document body, though heavily obfuscated, contains references to 'Acog abnormal pap smear guidelines' and application metadata, suggesting a lure to trick users into clicking malicious links. No scripts were extracted, but the presence of malicious links indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=acog+abnormal+pap+smear+guidelines In PDF document text
    • http://susojatafumo.22web.org/black_and_decker_corded_lawn_mower_mm1800.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474750/normal_6007275af2b50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506131/normal_603f2754a3fb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_6030144eb34c6.pdfIn PDF document text
    • http://salonop.xyz/wamitosemavotizabemipobwkdy1.pdfIn PDF document text
    • http://sungo1.space/the_blackness_of_blackness_summarywl279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401971/normal_6033a953d8dff.pdfIn PDF document text
    • http://immortal-sho.club/how_to_change_a_pool_pump_impeller8spvc.pdfIn PDF document text
    • http://taygerr.com/fegunnsiur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424040/normal_5fe5673241ff0.pdfIn PDF document text
    • http://brosbass.com/online_vet_tech_certificate_programsm080a.pdfIn PDF document text
    • http://rozisokotedowo.22web.org/how_to_reset_samsung_gt-p5113.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_b7745d78ba554aa4a6a4038a9e31db14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f165247-1677-4ad4-a494-28d25e46c49a/lidofafosapukev.pdfIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_6c804642830a459e961338000dc1adea.pdf?index=trueIn PDF document text
    • http://dawivek.rf.gd/creo_drawing_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb3007d-2753-4e67-a377-27b0a3920724/86486566387.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/acls_2017_american_heart_association.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_3bde3b74eade4520818181aa8c2e46db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1969bd-eec5-42c3-a330-d7f12ae24d15/what_is_the_traffic_light_system.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/vamikivevifi.pdfIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_4fb42c33dd49400d9a5bd0e435cda32f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/9666257852.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/free_english_printable_worksheets_for_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2014e9e4-78c0-43b2-82be-77149c67db7c/sebapanafomap.pdfIn PDF document text
    • http://daforewepon.epizy.com/model_by_laws_nsw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bfe24d8-f628-4c8b-bab0-701b2dd6d81e/zmodo_wireless_camera_reset.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_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 5524 bytes
SHA-256: 885dfa7d059e60f0f4d7039397503aa37e1064a80ffe4830424e61136cf2e2f8
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 11204 bytes
SHA-256: 3031ab909b8fe484bd4cceee80144e395513ea51e7ee7063a158598117e81163

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