Malicious PDF — malware analysis report

Static analysis result for SHA-256 71703b7ab63d6d49…

MALICIOUS

PDF

72.8 KB Created: 2021-02-18 02:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 323dae8b085fdc34ea4382da8389659d SHA-1: 92be3ec5228db115450c60d8e7d51fd1d9bc5755 SHA-256: 71703b7ab63d6d495fb60bdf56160098af30f6bf4bd6917aeebd2fb41b557fb9
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=biology+dna+and+mitosis+review+worksheet+answers PDF link annotation
    • http://zodoworusa.22web.org/middle_east_attendance_management_software_free.pdfIn PDF document text
    • https://jasezanita.weebly.com/uploads/1/3/1/6/131637239/4348182.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/0c4ghjb/40332604786.pdfIn PDF document text
    • https://litovabijoku.weebly.com/uploads/1/3/4/6/134666457/linoxewudi.pdfIn PDF document text
    • https://zebilukirun.weebly.com/uploads/1/3/5/3/135306511/d2729ca4.pdfIn PDF document text
    • https://tekagegi.weebly.com/uploads/1/3/2/7/132740997/zonigavowajed.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/likadojivivofu/ginivujodawafedidijelivi.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/chammak_challo_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/42105212662.pdfIn PDF document text
    • http://zadesejofugo.epizy.com/bunukevubodufisin.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/46852437987.pdfIn PDF document text
    • http://xewaxal.epizy.com/sabopawukaf.pdfIn PDF document text
    • http://felepav.epizy.com/jimikugojavupugi.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/adithya_dubsmash_application.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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 5608 bytes
SHA-256: 71477d3341c6406c2e24572733baaa057e62654650c66717b03beae4000684ce
font_01_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 11024 bytes
SHA-256: 067e716b0c5f63c399bc37dc3580a08f72370f429fd53fc29c5748cb0fd02671