Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccaf25bc556aecb…

MALICIOUS

PDF

77.4 KB Created: 2021-03-29 00:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 79da2b36c991ed0ebe768259d7ed2a10 SHA-1: 672dc6f468a203b36f76afea421c5da162e6bdf8 SHA-256: 8ccaf25bc556aecb275c7f6ba87f9280136048888ba3e044461d3d12a8927c84
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://pelibifir.ru/aws?utm_term=what+is+the+average+pay+for+flight+engineers PDF link annotation
    • http://fresh-ita.fun/finulubisimerovirefzz04l.pdfIn PDF document text
    • http://copyright-supporthelp.com/algebra_de_baldor_pag_145_ejercicio_89_resueltokesy9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_c6075567492c4bd5ac988ae9c66849e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/arumugam_film_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6757f92b-f503-4f46-9e46-3a3dea120533/the_dharma_bums_synopsis.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/antiacidos_efectos_secundarios.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_bf210fb35f064bf1aedbcdfa7739c370.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/dazuvelobojuvudeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35850eb4-a6ab-4752-a039-f821bc6dbabe/83771615048.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/wizarisa.pdfIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_ed89febe24ff453181a947140c96cec3.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_77bb6b948aa44e749dc9383b8826acdd.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_82c180114201413fa9839be2c6c42b84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/waxadigiredaxiduribom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4095035-55a7-4813-bee0-0028cf78ea1c/when_do_navy_advancement_results_come_out_2021.pdfIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_c1ad4c5b80ac48d895ce3b1d382baccc.pdf?index=trueIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_aac2aecc729a40c0ba5e32e523c1a508.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/xotojure.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/vudof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30072084-aa64-4204-ac46-c403c260ff55/christmas_carol_patrick_stewart_on_tv_2020.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_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 5340 bytes
SHA-256: 4739b0f1079e1daa74abb385309295798cfc3e25cbabb4559000c08d3d851e92
font_01_sfnt_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 10660 bytes
SHA-256: 14cb74f937f48ad499926782955859fbcb0993b960b8675cfd83764366f59f6f

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