Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f79430efdaeb9c4…

MALICIOUS

PDF

72.8 KB Created: 2021-03-24 05:28:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 05812245b1bb1aa67ee483f18131a2f9 SHA-1: bb58d09c6e2ee81b335db45ad7c96f8e70a187b1 SHA-256: 3f79430efdaeb9c4c67a515325dc45198d8ecf1339d905331b43be63c41ef82d
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to SEO-optimized redirectors and potentially malicious domains. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics indicate a pattern of using link farms and redirectors for malicious purposes, likely to distribute phishing content or malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

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://soxebez.ru/award?keyword=advanced+cardiac+life+support+provider+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/wufevinek/Fchjgsc/kijexo.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/hjhibTb/32213359196.pdfIn PDF document text
    • https://cdn.sqhk.co/vapiwibisa/hcjbTig/broten_br_7000_manual.pdfIn PDF document text
    • http://hq-cleartv.info/lalarodevuskahfm.pdfIn PDF document text
    • http://sbrf.link/pawifoxawebegik5xe1q.pdfIn PDF document text
    • http://worldthailand.fun/71044847318dczkv.pdfIn PDF document text
    • https://cdn.sqhk.co/zexupibo/giWPjaY/43509688162.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/eMNhiYr/live_voice_changer_free_no_download.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/tejuvonixag/building_muscle_101.pdfIn PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_4fa24c162d5149679720a531b319c3d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/biochemistry_books_satyanarayana_latest_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/bewupag.pdfIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_68362f9df5da4aeaa4ca7d917c149d88.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejifavo/51108469625.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/momopiwadogilitipumi.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/bioassay_of_insulin.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/euphonium_sheet_music_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 3260 bytes
SHA-256: bc3604f42a97857bd2622f881f131955f45824045271d21029646543de744c0a
font_01_sfnt_off0000de0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0F 5352 bytes
SHA-256: e513b8b6cf24a7f9009ae8dea35a572bf4aadc9b2fa58e4c89bb9d6469906b2c
font_02_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 10800 bytes
SHA-256: e996d4c5b4ab3e79253368327dde09231643ac3a43bcd8188ff15a2f7a9b85ab

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