Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bf747195b6d21e…

MALICIOUS

PDF

75.7 KB Created: 2021-04-28 21:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f79beb9f907001d5e2adeaf4fd8723c2 SHA-1: 20bcbd260182f4fbbf10d379e1f927b7b5769216 SHA-256: e8bf747195b6d21e9b66ced4c423520466670841429b5d391948562a47cf1e35
196 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which point to SEO-optimized PDF files, indicating a link farm. One prominent URL, 'https://bologen.ru/strik?utm_term=decision+tree+template+powerpoint', acts as an SEO redirector, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=decision+tree+template+powerpoint PDF link annotation
    • http://jewofuvivonog.getenjoyment.net/effective_public_relations_11th_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369502/normal_5ff5ea29412ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373987/normal_5fe1ef36bc2c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454575/normal_5fcd1001c9348.pdfIn PDF document text
    • http://wupozigujoruzar.22web.org/aviation_weather_faa_advisory_circular_ac_00_6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504568/normal_6001d6a7c697b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490001/normal_60044f737738e.pdfIn PDF document text
    • http://legexebe.medianewsonline.com/38663115298.pdfIn PDF document text
    • http://lakuberik.mywebcommunity.org/pajitenuwefizenevi.pdfIn PDF document text
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/ronamafudilum-wedojerubizij-nuxufafozobame-lamenafakorava.pdfIn PDF document text
    • http://lupazul.mywebcommunity.org/20110635939.pdfIn PDF document text
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/magamusuna_gadifolitaradu.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/risalenefazozo/vujuvibipinevi.pdfIn PDF document text
    • http://tukorokibenej.epizy.com/board_of_directors_minutes_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/jabafasosewagikositofe.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/los_emisarios_alvaro_mutis.pdfIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_407b91fc68614e749f03f322e90ca99c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedowedi/sunbeam_heated_blanket_microplush_10_heat.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/traduire_anglais_franais.pdfIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_24455cdb0b354599a71efbfdc3c3786d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/sosibiv.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_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 5172 bytes
SHA-256: eeca222e17ff31097a308bd3b105bd10923c9aec8722e73cab0c1f0ca38003a6
font_01_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 11192 bytes
SHA-256: 63c5b959cccf810914c133a4dbe4c74feecd06ad41688b5d1705389907319d1f