Malicious PDF — malware analysis report

Static analysis result for SHA-256 590274ab608bbfee…

MALICIOUS

PDF

77.0 KB Created: 2021-03-25 09:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c4385e84804c72a20a345fbdcc0fcf9 SHA-1: 9e5f6d33654a64d7fee72b4f676ab0b5503025e1 SHA-256: 590274ab608bbfeeb8ac9801bb6961985bf4e12c514d74cbfdd79046b670aae8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, indicating a link farm strategy. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially malicious or deceptive content, aligning with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=katie+sunshine+heads+will+roll
    • http://kartaidatodemeleri.com/candrael_s_charm_guidel5ti2.pdf
    • http://ipoteka.net/how_to_show_diversity_in_the_workplace6d5rc.pdf
    • http://knitfqph.site/zemed2ihj1.pdf
    • https://cdn-cms.f-static.net/uploads/4495694/normal_602a186089dcc.pdf
    • https://cdn-cms.f-static.net/uploads/4489599/normal_603df8e484049.pdf
    • https://cdn-cms.f-static.net/uploads/4481059/normal_602ed0b101e31.pdf
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5fe0d92cb1b33.pdf
    • http://1yamal.space/psychology_facts_about_human_behavior59cym.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8cf9973e-1544-47fb-845a-06afc20be268/41109940670.pdf
    • https://s3.amazonaws.com/wazotojemov/jikevotejexiguvitefisa.pdf
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_d794697a36cb4bc1803fddc8da655421.pdf?index=true
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_659bb5f454c04faf8536f461d8281eb1.pdf?index=true
    • https://s3.amazonaws.com/zunaduxa/30125291006.pdf
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_68124f5fb0cc49b5b22f3772f9e316f6.pdf?index=true
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_e4439b26cad544569ecdba4893bc5650.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c308b831-528f-46f5-8e40-2213d1654d39/bejon.pdf
    • https://uploads.strikinglycdn.com/files/90797386-d1bd-45fc-b659-6cec75397fdc/ayso_safe_haven_program_defines_training.pdf
    • https://uploads.strikinglycdn.com/files/a1c2516c-c311-4b65-82c0-7b18b1dae73c/76129790716.pdf
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_3f6f467e9cac40a3acecc5c3c9ad3c37.pdf?index=true
    • https://s3.amazonaws.com/nonabafat/paxubujisobuk.pdf
    • https://s3.amazonaws.com/dazovosugev/android_pay_works_in_india.pdf
    • https://uploads.strikinglycdn.com/files/709c2d58-01fb-41e3-933b-9bed2d40604d/what_is_the_best_training_app.pdf
    • https://uploads.strikinglycdn.com/files/87ceefe8-e266-413c-886c-f3a0c9dc3c2f/fururoxukedafola.pdf
    • https://uploads.strikinglycdn.com/files/bdf0db5c-b5a4-45a2-93e2-0a71494f4e86/56775046283.pdf
    • https://uploads.strikinglycdn.com/files/415b9555-f409-4662-8bfc-29fb962f0136/percentage_venn_diagram_questions.pdf
    • https://s3.amazonaws.com/regufojalojaza/ardms_pediatric_echo_clinical_verification_form.pdf
    • https://uploads.strikinglycdn.com/files/edea7deb-644d-4c78-9096-f1ff8dcca588/fabokizorowemekodemi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effb.bin
a09c4ffcdf35cd71fe27df005ecf61554e2088d17750f649b2301f1aabb359b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 4972 bytes
font_01_sfnt_off000100f3.bin
55c077997e18db7edf304ecadc0bd3e06a80d8529c7ed69c6774f60576d5cba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 11236 bytes

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