Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada1a66f97bd77b8…

MALICIOUS

PDF

87.0 KB Created: 2021-02-22 14:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a21c978b8f5573904b490299f0d7f082 SHA-1: d53e044d05f93fa67a9dc0f93e562251e2008844 SHA-256: ada1a66f97bd77b842950ce47e3c923947b04ea3705adafb6e03ff41a9edd2ef
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a trigonometry calculator keyword. This suggests a phishing or SEO spam campaign aiming to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • 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.
  • 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://leonvi.ru/wb?keyword=trigonometry%20formulas%20for%20triangles%20calculator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375206/normal_5fd1711275460.pdfIn PDF document text
    • https://peguduzivinaw.weebly.com/uploads/1/3/1/6/131606374/01182.pdfIn PDF document text
    • http://good-production17.site/wuzazo7495g.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/iijgjjG/39939614254.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/gPqhmuD/movie_box_free_online_movies.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387033/normal_5fefc716ce827.pdfIn PDF document text
    • https://telixezudaridif.weebly.com/uploads/1/3/0/7/130775339/26d6ff7c143a7fd.pdfIn PDF document text
    • https://cdn.sqhk.co/lukumuzu/gfsidBh/car_crash_last_night.pdfIn PDF document text
    • http://zoziwasikow.22web.org/88331542280.pdfIn PDF document text
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/jelevud.pdfIn PDF document text
    • https://cdn.sqhk.co/sajunabinume/rggiQaR/xopegenobonofuzukutejovu.pdfIn PDF document text
    • http://karaulovlife.site/30014490801wllfh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421781/normal_5fcb8db7c74be.pdfIn PDF document text
    • http://smartbright.club/installing_transducer_on_minn_kota_power_drivef9xts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulawev.epizy.com/1999798368.pdfIn PDF document text
    • http://rifoxofome.rf.gd/anime_go_watch_apk.pdfIn PDF document text
    • http://zepedijuva.epizy.com/aspekto_ng_pandiwa_worksheets.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_off000118ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 5252 bytes
SHA-256: 142ba63627abb1bd259996aa704673e6fab606438e1c4fc12507853afb89ef7c
font_01_sfnt_off00012a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 10508 bytes
SHA-256: a63c210f093e31e081a6bc30e40d8ac082f3c3eda633b3c577b2d82658e9126d

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