Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e43dd0d47a402b…

MALICIOUS

PDF

80.7 KB Created: 2021-03-11 14:56:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 699527e3771fc0c88054544e4c9f3e6b SHA-1: 1c0528e1e8710fcb1bd21bafc87e5d4dce447b06 SHA-256: 85e43dd0d47a402b565eafd2db8d4ae73ebea1e98e879d103a462e5f0bb8e618
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs, with several pointing to suspicious or unknown domains, suggesting an attempt to redirect users to malicious content. The presence of 'Card. io android example' in the document body, combined with the external URIs, indicates a likely lure for 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://pelibifir.ru/123?utm_term=card.+io+android+example PDF link annotation
    • http://vibubag.22web.org/vebapekolusafusilafiva.pdfIn PDF document text
    • http://aarbuz.space/728362807098i60d.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/Rnggwja/sliced_bread_recipe_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/gcvyl79/pixelmon_mod_addon_for_mcpe_1._12.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/hGU0jap/lyrics_hail_mary_2pac_makaveli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_6038735aa49e5.pdfIn PDF document text
    • http://reduslimer.website/gomipamupojebabor3pp81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_600bf80d03f03.pdfIn PDF document text
    • http://re-prime.ru/interview_questions_and_answers_for_certified_nursing_assistants9180m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387718/normal_5fc8c058f4238.pdfIn PDF document text
    • http://lumurezekosarew.66ghz.com/59690887073.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/KbdGVhf/nexejilosawoda.pdfIn PDF document text
    • http://businesslinecenter.com/89489463897ezgcx.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/pQBjghe/amazon_golf_clubs_callaway.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/zamuriza/85224712739.pdfIn PDF document text
    • http://gojexigubobe.epizy.com/94938465223.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/delete_watermark_online.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/artemis_fowl_the_time_paradox_weebly.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/broadcastify_pro_apk_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/the_enlightenment_and_the_american_revolution_worksheet.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_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 4932 bytes
SHA-256: 3f4279399d633a31961717564942f52e81ea47d7c511b5fbeac21b08b8601b28
font_01_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 16684 bytes
SHA-256: feb336bd24616185d7b969a01875223d0f4d833de7072f05930c2c4688fd17cd

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