Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c5e91de665f051…

MALICIOUS

PDF

171.3 KB Created: 2021-04-08 23:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e9f0234f6baf207ec8ace98162895ed8 SHA-1: 93df2da5a6a81779603e6511f25e3fe695b806f1 SHA-256: 88c5e91de665f0515c7b992a8413641e96b283f5a6fac426c10d71aa75d02967
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9995

Heuristics 5

  • 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 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://fokemale.ru/strik?utm_term=orbital+mechanics+prussing+2nd+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409602/normal_60224610474fb.pdfIn PDF document text
    • http://momegitufog.22web.org/nezurekanutineko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_601b65bc8be2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_6069798e3502e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_6025012108abf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c380ace6-9479-495a-a025-f432e7dc2d6a/kenmore_795_freezer_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/mixima.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/basicity_of_aliphatic_amines.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_f68de6d5c76948e19346d241b177d404.pdf?index=trueIn PDF document text
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_969678fc12e94cbab56905a3c56423ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ditiruz/81879388781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51bc1c3d-5399-4b38-9d3c-e38979cfcf24/business_vocabulary_builder_emmerson.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_52b216f15dc34f6e8968d96db3c1229f.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_fedc1a565259430e8a8a217dfe10bfc5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7494dc36-fb93-48b8-acfb-eb6586265129/lg_microwave_lmv1683st_not_heating.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_1da2d64530294af48c7ce2384689220c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/joterige/verijejolebevilujugajelar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0353967f-e156-400e-beb2-16e32c011c81/35138632581.pdfIn PDF document text
    • http://ragoposetetadu.epizy.com/disable_restricted_mode_on_android_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8012f224-9294-4852-8a0d-7bdbb07dc223/how_to_use_a_petsafe_wireless_fence.pdfIn PDF document text
    • http://jufofokisib.epizy.com/generos_discursivos_tipos.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_off000255b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x255B1 5868 bytes
SHA-256: 4f534d2c094700f3b340cbc989c4bb9051e8be13cd46293c38b06cac2a6c0ccc
font_01_sfnt_off0002697a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2697A 15620 bytes
SHA-256: a82acfdd93f8ca57c7091fe4d418faab9922bfb0e2c09e280b2bff3699137edd

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