Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb27db8ee7c2098…

MALICIOUS

PDF

70.7 KB Created: 2021-02-01 08:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 207295fd7664a7c6ec6db0afe0d9b502 SHA-1: bf7e0edf1d59fe1f3c0a5f6c9deaff0e5ffc3006 SHA-256: 4fb27db8ee7c2098b3fb425ab01e75f7439e97efbf4d68c3df316a3573a4704e
254 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=leaf+pigment+chromatography+lab+report In PDF document text
    • https://popetebebulexu.weebly.com/uploads/1/3/4/3/134316921/kefivo_tewazosa_nalefomivofij.pdfIn PDF document text
    • https://gakutuzopekok.weebly.com/uploads/1/3/4/6/134605442/4713537.pdfIn PDF document text
    • http://bestsaleshopin.xyz/xejagepesatixajexirwey7q.pdfIn PDF document text
    • https://xavodumofas.weebly.com/uploads/1/3/4/9/134901052/sijeganidorefefali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_60115f37e7429.pdfIn PDF document text
    • http://mmmmmme.space/puvanupamubodujofuwefibo3nfw.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/nafoxuda/nozixegoke.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/gorepulenigewarabogize.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/3946375238.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/zitonarupofaw.pdfIn PDF document text
    • http://bavabime.rf.gd/cadbury_dairy_milk_ad_video_song.pdfIn PDF document text
    • http://lexuwusifo.epizy.com/90351820275.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/list_of_all_irregular_nouns.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/miraculous_guide_to_gwent_white_orchard.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/peluzapizuwozajuxavagasob.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/krajowa_informacja_skarbowa_43-_382_bielsko-_biaa.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/90652271425.pdfIn PDF document text
    • http://monulaw.epizy.com/chemische_formeln_zeichnen_word.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_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 5432 bytes
SHA-256: 870d2ea447799829f929ec95dda9a7d89821da3691fbb1064b14f9259cc5dc96
font_01_sfnt_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 10648 bytes
SHA-256: b51c8977cd90a3d2585765e57484a6ad0236fcd8af6dc079b5be8c5e2db6e519

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