Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f304b3afb9f560…

MALICIOUS

PDF

85.7 KB Created: 2021-04-13 14:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ae4989aad306708300ebe9694700879a SHA-1: 2109eab3f6725d0eba33deb1b85cb39c78ee774c SHA-256: 53f304b3afb9f560d78139956744d44ade1b77ca75e14c1565a2c2366195adc1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nipisod.ru/strik?utm_term=overcoming+gravity+2+charts PDF link annotation
    • https://regajuwanuduxis.weebly.com/uploads/1/3/4/3/134319991/ba968a86f3c3ac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_605fda26753f3.pdfIn PDF document text
    • http://kiluzilaw.sportsontheweb.net/xirulizo.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/58618631497.pdfIn PDF document text
    • https://susafoxepi.weebly.com/uploads/1/3/0/7/130775374/adb41567ba91.pdfIn PDF document text
    • https://mawafusujomadil.weebly.com/uploads/1/3/5/3/135351104/pupinefonakitib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388050/normal_5fefdbb59c06b.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/jariditovunuguvulige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_5fd9dbfa0133f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_60243d68857ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370088/normal_5ff175f84ab58.pdfIn PDF document text
    • https://fokinovev.weebly.com/uploads/1/3/0/7/130775288/taroxej-zeloligokasor-gatukavegolojer-wogotelegen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_e39f30ad938f42ef9f40be3eb9a2273c.pdf?index=trueIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/technical_analysis_of_the_financial_markets_by_john_murphy_epub.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_777fe3981b084901a8158870e9e0edcc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e635c64-f7cf-4eab-8ff3-57889903387e/gezixojamutoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cef9d14-7819-4557-a8f7-fb6c0ca75c48/zasozukesavabenejife.pdfIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_cf60d0bf2845469b85b2719a722788e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28e09740-8e54-4258-8af4-7fe48840aa3b/champion_generator_9000_watt_costco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b98f0b-b680-4921-a181-45513536770b/is_there_a_battery_base_for_echo_dot_4th_generation.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/55946879126.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_b579d9d29f9342c195fbe4cd044833cd.pdf?index=trueIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_5f21106519914834bd810129423bc326.pdf?index=trueIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_898fd02920b74d4cba38f354d206b2cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc26a64-082f-4faa-971b-c4c81671dc4d/20575578923.pdfIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_b5de639295de408686fc3df93d8ca408.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 5292 bytes
SHA-256: 90a28c3a9beecb4611029e576df3a7662e6f1ba070711cbc772842682fc3318a
font_01_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 11560 bytes
SHA-256: 1f4e675eb1f7e7e466b9c10901ba35961f746d906e0db115bd6c5aa60d523a4d
font_02_sfnt_off00013986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13986 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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