Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa70a7ab986db52…

MALICIOUS

PDF

77.6 KB Created: 2021-05-17 12:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a7dc888babfff5663f33af885e687348 SHA-1: 787b75f749d99d406d5494ed32b58ac6987a42a3 SHA-256: caa70a7ab986db52ea116a25573e8f0d2dd42439c78be6c64caa40392b8688c4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to deceive users. The primary malicious URL, 'https://midufefew.ru/strik?utm_term=what+is+draining+my+moto+g+battery', is presented in a way that mimics a search result, aiming to trick the user into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://midufefew.ru/strik?utm_term=what+is+draining+my+moto+g+battery PDF link annotation
    • http://pakirekugep.scienceontheweb.net/maxegorobejozafugiguje.pdfIn PDF document text
    • http://dipolomisegon.iblogger.org/learn_autocad_basics_in_21_days_download.pdfIn PDF document text
    • http://mebelrostov.ru/64391390913qib1o.pdfIn PDF document text
    • http://7lessons.space/free_acapella_maker_apk_full4qeuj.pdfIn PDF document text
    • http://8bitbeardsco.com/34807282204ymfuz.pdfIn PDF document text
    • http://fesunasisodenod.getenjoyment.net/kt_tape_ankle_stability.pdfIn PDF document text
    • http://jodopafipunew.22web.org/anglo-_saxon_chronicle.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/c7f20500-e026-484b-aca6-95d8654b7cac/respironics_remstar_m_series_cpap_humidifier_and_smart_card.pdfIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_6aa0324dceb544fe80b1572f63b0fcc7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezutu/what_size_wood_chips_for_electric_smoker.pdfIn PDF document text
    • http://vikalasur.epizy.com/who_gmp_guidelines_for_veterinary_products.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/71662086418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aff8813-c953-4ab0-b711-86269ee74e22/77882473746.pdfIn PDF document text
    • http://voxotili.epizy.com/mod_games_app_store_apk.pdfIn PDF document text
    • http://zaxatuparogojix.epizy.com/zovorojobibabomataji.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/agni_natchathiram_movie_single_part.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/troy_bilt_squall_210_oil_change.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_0cb0b9d3e1d54e1f844f3035965bb85d.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_20771870dfd34fc5907e7a57cf107604.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_8e1782e54a48414da3bcd26037dcdfd3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 5460 bytes
SHA-256: ba45e4c66fca0091972c1ba2b452fdb997b5cf2856a923542665346d4105a671
font_01_sfnt_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 10888 bytes
SHA-256: 1cce94a76611256f89ba56ccd6a0c5ef3a23322256d758edfbc5198e8657d20a

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