Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a7001974fc2018…

MALICIOUS

PDF

67.6 KB Created: 2021-02-15 06:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 3bf3b46e05bb9b254d7be8c392dbe729 SHA-1: 3519ff38dff91d59569e366304abcd789783fbf4 SHA-256: 88a7001974fc20186e7002bc19b663eab058ee4bb737bd9a6012def2422ec854
144 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=xmodgames+apk+download+for+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419629/normal_5ff0456c23f33.pdfIn PDF document text
    • http://rujawobezixevib.iblogger.org/microsoft_flight_simulator_x_mac_free.pdfIn PDF document text
    • https://mejotowud.weebly.com/uploads/1/3/0/9/130969644/nubivaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482009/normal_600cecc3f23aa.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/gPbHsSN/greatest_hits_radio_fm_frequency_north_east.pdfIn PDF document text
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/nodagiruk-kolobusovil-lefatakotesaxom.pdfIn PDF document text
    • http://vabuletarikinil.iblogger.org/87861256018.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/WNnva4h/pet_dard_ka_doctor_near_me.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/2f897007.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/7b37ab11c260e2.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/sitok/agerigna_amharic_keyboard.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/sivizuxuw.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/bosch_security_systems_software.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/gomulevatibir.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/zaxiz.pdfIn PDF document text
    • http://lalukegadugubu.epizy.com/aunt_jemima_complete_pancake_mix_nutrition_information.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_off0000cd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD51 5492 bytes
SHA-256: d5ec49535d015be99c91c7d9310c826f6b7e8bbaffb9ba2e58fa981dfeec7903
font_01_sfnt_off0000e001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 9848 bytes
SHA-256: 831a0bb2be1595885c84c2bad48e4a32acf4d5e35d23f547fb62255174ef2130

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