Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ec3afb679a2a92…

MALICIOUS

PDF

76.1 KB Created: 2021-02-14 03:09:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c2658721f089cf5930a425da84076c10 SHA-1: 7274abac2c2f8e122adf92372d1da7dc480efd84 SHA-256: a7ec3afb679a2a9230f0eab402c3d3dde7b29dbce920c13d592ffa1f741d95f2
244 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or spam campaign, likely using a link farm to obscure the final destination or to improve search engine ranking for malicious content.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=what+to+do+when+your+bored+at+school+and+have+nothing+to+do In PDF document text
    • https://neranoliva.weebly.com/uploads/1/3/4/2/134266014/27bf884a8b4.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/ohi9ujc/american_football_band_albums.pdfIn PDF document text
    • http://proflist-barnaul.ru/jevamusupewamamapodilirajdta3m.pdfIn PDF document text
    • https://rarinuda.weebly.com/uploads/1/3/5/3/135349313/riwikapudi.pdfIn PDF document text
    • http://kernig.pro/9369837384cc6as.pdfIn PDF document text
    • http://excellent-spb.ru/257683090200bii.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/880283.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/cgd5igx/94893152252.pdfIn PDF document text
    • https://vukivogo.weebly.com/uploads/1/3/5/3/135329669/664334.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/katureziwulaxam-wezepod.pdfIn PDF document text
    • https://xirazaju.weebly.com/uploads/1/3/4/8/134859293/tilakeximi.pdfIn PDF document text
    • http://firstflirts.site/258839526374kmuq.pdfIn PDF document text
    • https://kuduxuke.weebly.com/uploads/1/3/5/3/135323303/e4913a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369919/normal_5fecb59fe158f.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/hiacIOK/kerasuzojagegu.pdfIn PDF document text
    • https://zokukomusisitu.weebly.com/uploads/1/3/5/3/135323242/zogefivuvok-momazimunojod.pdfIn PDF document text
    • https://vopilexazum.weebly.com/uploads/1/3/2/7/132740267/duvire_liwedunur_rutofesemipunar.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_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 5608 bytes
SHA-256: 75b987a8116b57dcd409a29546e649d21a1ef443985c883e47dec0c997b0e6df
font_01_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 10812 bytes
SHA-256: 1a53a4b4fa8598873512cb6cf515ef3dc6752c26d8a7d5944fa97c762bdaf1f5

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