Malicious PDF — malware analysis report

Static analysis result for SHA-256 a898bf91c4787322…

MALICIOUS

PDF

72.6 KB Created: 2021-03-02 15:06:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 8ab7c76639b4a234552adeabe752b589 SHA-1: 2a1722c8e1bc0a00e779738598c6aa2487393e0f SHA-256: a898bf91c4787322cc6dd194eac5b6a7af6744558315910e8b5ea0fae72720dd
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://xajibur.ru/award?keyword=everyday+use+alice+walker+symbols PDF link annotation
    • https://cdn.sqhk.co/kojetovukufo/f89jdia/cubic_street_boxing_3d_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/5jj62jd/89105881440.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473039/normal_6005baaf9fcff.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/jaFYhfo/bmc_software_stock_price_nasdaq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412573/normal_5fce52cc1cd61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_601535f35b18d.pdfIn PDF document text
    • http://zoompol.xyz/hp_6500a_plus_user_manualinraz.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/ih5iegi/capsicum_chinense_plant.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_603836bb97ee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_602c7e90b6bcd.pdfIn PDF document text
    • http://mainsale.info/681572150879ev9r.pdfIn PDF document text
    • http://datinge.site/devi_bhagavata_in_kannadaus6al.pdfIn PDF document text
    • https://dupopawo.weebly.com/uploads/1/3/4/6/134652833/0ca298d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412774/normal_5fd6735b4b891.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501991/normal_5fc8ea911a00c.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/6ijgiRw/uci_world_championships_2018_mtb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452861/normal_5fcf1625af3cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402717/normal_603a1e1e8395b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 5500 bytes
SHA-256: 2849ea9127f171f11ebfe10fc915c485258ac5c08b147a645c30c2cd05edda97
font_01_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 10104 bytes
SHA-256: 7d82a22cce3ea442dac3eb58df3f1402e81a486e3f0de8e005ee78204e37f227