Malicious PDF — malware analysis report

Static analysis result for SHA-256 4545a7776549b2e8…

MALICIOUS

PDF

70.5 KB Created: 2021-02-09 11:20:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: f53d6a56280812806a2dc6173c163b45 SHA-1: 8a671ca2d6fedfcb1977fe0e190b1b2418d091c2 SHA-256: 4545a7776549b2e869ac15121c45c7aa733d4893bfe7a57ce605761b74e51b6d
236 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/wb?keyword=amherst%20college%20major%20declaration%20form PDF link annotation
    • https://lekopejener.weebly.com/uploads/1/3/5/3/135323345/wapodik-regubu-fixijelabolaz-benonij.pdfIn PDF document text
    • https://cdn.sqhk.co/gasajolop/qicYjcy/rolling_sky_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/iWigdxH/krome_studios_kickstarter.pdfIn PDF document text
    • https://tojemiwavujiguv.weebly.com/uploads/1/3/4/4/134468879/bemowebuzavo.pdfIn PDF document text
    • https://cdn.sqhk.co/xewumoxu/gQjgqii/installing_pvc_pipe_under_sink.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/thaMEgd/56992488575.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/QQicibM/dungeon_keeper_mobile_guide.pdfIn PDF document text
    • https://kusovagojevo.weebly.com/uploads/1/3/4/8/134883394/pologikopadi.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/ahb6qdj/how_to_bake_spaghetti_squash_in_oven.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/hijhdji/spinal_tap_castellano_mega.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/gurupixabogivaz/best_android_tablet_2018_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/bomanimogejaloraros.pdfIn PDF document text
    • http://kixozixid.rf.gd/tifixikixetaja.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/billiards_games_free_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/jiwopogujuporijivejuze.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_off0000d6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 5500 bytes
SHA-256: bc364aebc7690cd4d5188d6b77fdfe857b07f98444244ed7da4cff3c6224c8ec
font_01_sfnt_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 10588 bytes
SHA-256: 5eef31a64c54c9ce8857da9de9b0517e8b2de0efb1834f00b75eb458c8ceebf5

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