Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c41bc21d0d1b2b0…

MALICIOUS

PDF

75.9 KB Created: 2021-02-02 21:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: c5af997e5a7e35d8a9d811995934707a SHA-1: 6dba0e51d9710ebb898c50fd9c6e32ea7d2eb6d5 SHA-256: 4c41bc21d0d1b2b0e2076e3fd0ef9830b441326fa02f237574329d557f0aca2a
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=wrong+turn+1+telugu+dubbed+movie In PDF document text
    • https://cdn.sqhk.co/mufipofunup/g99hdje/45359215568.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/samekur-setitolewosud-mivuvi-nuluvezuni.pdfIn PDF document text
    • https://zibiputuwe.weebly.com/uploads/1/3/4/8/134886395/dedcb5d2eb.pdfIn PDF document text
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/ditepedaxavu-nanufinexumoto-gekesut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446152/normal_6000af5250447.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/vixegapite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369919/normal_5fcca4a35c0fa.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/geicgin/best_romance_books_for_teens.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402960/normal_5fccd90ea417f.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/erjhiec/budaralitelapesifavu.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/3fCicne/lock_screen_wallpaper_hd_anime.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/hjcghWZ/leapfrog_leapstart_3d_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/kjeMbhh/suppress_definition_in_tagalog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5fe56bfdbd721.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/evGa0ji/miui_5_icon_pack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 5024 bytes
SHA-256: b1d6370902f5f7bf230cfc3587a1e677695a3913f264b008a81b5d09e04c2893
font_01_sfnt_off0000fec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 10720 bytes
SHA-256: 1b37b41ed2539000718c86975e789401b0477d5fbce5b3c73ed00c84fccc4b18

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