Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37c2bb56ef81167…

MALICIOUS

PDF

72.8 KB Created: 2021-02-17 13:49:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 843f51e1fe39557e741e47ded467bea1 SHA-1: 5086fbb24338fc28b877e6c0f097bb818dfee188 SHA-256: a37c2bb56ef81167cf6e02835e7802b98ac43362bbd2592eb93b29ced7255079
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/wix?keyword=the+death+of+ivan+ilyich+themes+pdf PDF link annotation
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/2cc692b62d6ca4f.pdfIn PDF document text
    • https://wudegilunukoga.weebly.com/uploads/1/3/1/3/131379548/tosevuwuxasorepoje.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/3dda6a74780.pdfIn PDF document text
    • https://jalaxogazumin.weebly.com/uploads/1/3/4/3/134373329/07097cc.pdfIn PDF document text
    • https://lelobetiladafan.weebly.com/uploads/1/3/4/4/134497055/d50fce4.pdfIn PDF document text
    • https://julogunakununu.weebly.com/uploads/1/3/2/8/132814048/wevum.pdfIn PDF document text
    • https://pokuzasovud.weebly.com/uploads/1/3/4/1/134108684/sadaxizidojuze-jikixujebuxivaj-ponibunakofini-lebuzew.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/miledu/why_isnt_my_frigidaire_ice_maker_working.pdfIn PDF document text
    • http://wuxojawe.epizy.com/vuvipokuroburufufe.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/answering_law_school_exam_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/tour_guide_meaning_in_malay.pdfIn PDF document text
    • http://gapitufukiwiti.epizy.com/51868273616.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/mapozepubejusi.pdfIn PDF document text
    • http://rodijegowufewap.epizy.com/davaxexefuwux.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/employment_insurance_reporting_manitoba.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_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 5408 bytes
SHA-256: 464e16b361c060eed45fdc52419bc7c4d618000fde76ed6a97342d4c29978ce7
font_01_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 9984 bytes
SHA-256: 5c8cafed6e94ae787eda72c92163b10a31acd9356d8ae08d1ef9580e356f0fdb