Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3ed3cfeb3407b5…

MALICIOUS

PDF

77.0 KB Created: 2021-03-28 12:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 34d278b7f28d322ee9cef2adf1d630cd SHA-1: 74ac51ce51ac2e12a5e46e6da2c0540cdeaf6707 SHA-256: cf3ed3cfeb3407b50a4ba36e5cb14fdbc344f3a5f49c941b5f4c1d6eb466ef28
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 0.9991

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://bologen.ru/wix?keyword=hydrated+crystals+lab+conclusion+answers PDF link annotation
    • http://duvesawolaxu.22web.org/onkyo_tx-sr505_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487386/normal_6032e074422c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492875/normal_6042da1dd4eda.pdfIn PDF document text
    • http://diwokaxojizo.iblogger.org/can_you_cook_risotto_rice_in_water.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403565/normal_5ff77a48d8874.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxegejedak/gjhihjc/pidetagaxuvalezukotaj.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/VjegpC0/xewuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_601bcc3fbf7e7.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/jijig2v/busumasadajuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_603587ae55a31.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/ZlQlNjh/electronic_light_ballast_disposal.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/lunojol/what_to_do_when_your_dog_dies_uk.pdfIn PDF document text
    • http://terezeso.epizy.com/cashless_society_pros_and_cons.pdfIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_b2ad7a163bc54a5286eb8c3e96fdef3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/fakonen.pdfIn PDF document text
    • http://putojeferef.rf.gd/zigovemesuliramomaluwop.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_9f78cec875fa4f9faf9969757ed7c838.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_b5f10f4c758e43ee94c15478456da7f3.pdf?index=trueIn PDF document text
    • http://dibogazosenu.epizy.com/one_step_equation_word_problems_addition_and_subtraction.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/nevuxuxomipufugenigejoje.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/tixawaputozivujoz.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/sukufomiziloruwizigexute.pdfIn PDF document text
    • http://vilijakuji.epizy.com/makkar_ielts_speaking_cue_cards.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_0bb455991cca4e64a7afd69897129892.pdf?index=trueIn PDF document text
    • http://pebodupa.rf.gd/brk_first_alert_9120_battery_replacement.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_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 5228 bytes
SHA-256: 78088a352881ad58f89f5c267b33ac2c25a10fe686e6d65fac1e9f9ec490dc77
font_01_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 11392 bytes
SHA-256: 07c4ee28559b0902fe9bbfea1ea9773387cd23bd2a7402bc85a28be42b17dfd6

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