Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4af4f0b6b51f51f…

MALICIOUS

PDF

80.3 KB Created: 2021-03-08 05:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 58022f93e16a4c9ee8b917c817e2a789 SHA-1: 36992e6e05d75d2b97d6a18eb7c2cf3903c14634 SHA-256: b4af4f0b6b51f51ff2c29d495ccbe999eddc769fec74831532bc5003d1c23acf
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable domains and redirectors, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs, such as 'https://yafferge.ru/strik?utm_term=how+to+calculate+gdp+from+national+income', are indicative of a lure to a malicious site.

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://yafferge.ru/strik?utm_term=how+to+calculate+gdp+from+national+income In PDF document text
    • https://cdn-cms.f-static.net/uploads/4501775/normal_60403543d0173.pdfIn PDF document text
    • https://cdn.sqhk.co/zujijivopuju/hc0k8hb/asteroid_hitting_earth_gif.pdfIn PDF document text
    • https://wazexexa.weebly.com/uploads/1/3/5/3/135305699/lokolipinul.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/dgficia/rope_hook_climbing_building.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411681/normal_6003aa6c550f3.pdfIn PDF document text
    • http://wide-mean.top/blank_map_of_ancient_greece1yd1j.pdfIn PDF document text
    • http://minosijasif.mypressonline.com/63403862680.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/cd3hjgh/detewebalel.pdfIn PDF document text
    • https://dafelubuvotaxid.weebly.com/uploads/1/3/4/7/134753950/tuxobega-rumax.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/logitech_create_keyboard_backlight_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_6041c77cc0085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403539/normal_6011c8271465d.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/nationalism_in_india_by_tagore_wikipedia.pdfIn PDF document text
    • http://curvepreloved.com/kiziwovula35bpv.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/55ianMo/36194861702.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_e731f7d58493409da49b02b6200fcad7.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_ed7a748df06847c2b2b9b39d05f18d79.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_4d4e1532a49f48b987946c9c2f2f7642.pdf?index=trueIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_b17c8f9c51224273b2f79e1b165cd745.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_b407e3a703a442c7b531d1f397ef8103.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 5232 bytes
SHA-256: 9765cac6b7a66cae37b247fbc72256f4caa61d0731b8e7ce345d8b3a4b87bdd8
font_01_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 10972 bytes
SHA-256: 502db43b37d859cfd7be36aaf740b61ee2480ff8f08cb4a62b6b51073b7c5c5e
font_02_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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