Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd71b94a4139ef6f…

MALICIOUS

PDF

72.8 KB Created: 2021-02-28 12:31:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: d8594b5b26e48fa340c3dbb17e966575 SHA-1: c414dd47a88d7cf47cf2e45e89cf458cdeeffa20 SHA-256: fd71b94a4139ef6f9e4f57fd019278c5c65ea7bbab11963be41af66917e8f8d6
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://jottigo.ru/award?keyword=computer+science+illuminated+7th+edition+chapter+1 PDF link annotation
    • https://niwifexugebap.weebly.com/uploads/1/3/5/3/135316215/vafov-sabek-belido.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wujukigow.rf.gd/mera_bhola_bhandari_song_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/85535107396.pdfIn PDF document text
    • http://zatunikepozis.epizy.com/boar_s_head_american_cheese_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/tracker_template_google_sheets.pdfIn PDF document text
    • http://niwerujegip.epizy.com/nadaxobotuj.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/mukajisobefifon.pdfIn PDF document text
    • http://bojonovaja.rf.gd/arial_rounded_mt_bold_normal_font.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/53316480734.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/21841190227.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/11762189839.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/transunion_credit_report_vs_equifax.pdfIn PDF document text
    • http://kalujagemivinid.epizy.com/25912318456.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/65684842449.pdfIn PDF document text
    • http://xaposekesudonod.epizy.com/act_math_practice_test_with_answers.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_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 5352 bytes
SHA-256: 81e44daea2b0cf523fc326e812020aac5a31ff8689d4d15bc93be31104304f66
font_01_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 10144 bytes
SHA-256: 8dedeff2789c1bcfa44ecd3ac5f7ce152a4b8ce36cb42bd764f31d32c147e38d