Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdfd7095bc93216…

MALICIOUS

PDF

78.5 KB Created: 2021-04-03 02:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3b0b4fe15334bf47aa04ab1c31e63bc7 SHA-1: b21a26670fbaa3f7043b6707fb6007cf0ad07654 SHA-256: cfdfd7095bc93216635740a5741dd18c962b175c11dd7e981f3c4b9b4a6a8e07
254 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to redirectors and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to mathematical functions, designed to mask the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/strik?utm_term=is+every+continuous+function+differentiable In PDF document text
    • https://juguzitusiketi.weebly.com/uploads/1/3/4/3/134372303/gitejowegetu.pdfIn PDF document text
    • https://zatenumidepav.weebly.com/uploads/1/3/0/7/130776458/1649323.pdfIn PDF document text
    • https://kofijowuz.weebly.com/uploads/1/3/4/4/134446653/fodizali.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/5581001.pdfIn PDF document text
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/7298640.pdfIn PDF document text
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/xovokite-goxumewovewire-gewitunajulene.pdfIn PDF document text
    • http://subexadedesu.iblogger.org/desekoxorevivu.pdfIn PDF document text
    • http://rufamegepijuwo.22web.org/bookshelves_plans.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/6eb4c93d3d.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/kevava/furofofosoxipalomilek.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/envision_integrated_mathematics_2_answers.pdfIn PDF document text
    • http://sewegijod.rf.gd/html_to_jquery.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/lananulipukekorigoz.pdfIn PDF document text
    • http://resawopo.epizy.com/embedded_operating_system_software_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/39881192869.pdfIn PDF document text
    • http://kezulixu.rf.gd/1806689786.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/how_to_connect_remote_to_dish_network.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/bobirenesixodupisowafivu.pdfIn PDF document text
    • http://mewumajobivu.epizy.com/55415714191.pdfIn PDF document text
    • http://sovizaz.epizy.com/96570778141.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/android_sqlite_update_primary_key.pdfIn PDF document text
    • http://vibibidazez.epizy.com/14548349227.pdfIn PDF document text
    • http://tisigivikevutik.rf.gd/kumon_7a_reading_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/18176335849.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_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 5256 bytes
SHA-256: b6cbb11b820c1a149409395b0469288269e0a38528c182fda1dbd7a83548bef6
font_01_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 10584 bytes
SHA-256: a66f4feee5861866cfbfb2c39c721510d88c26427c1435eb460b176711c1bae1

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