Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefaf5b0cef9a341…

MALICIOUS

PDF

70.8 KB Created: 2021-03-31 05:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8b3e93e6a8e69a78c6c243726a472722 SHA-1: 8dc6a358b58f1fbe8bdec46b4cf51b519b08bde7 SHA-256: fefaf5b0cef9a341385881ab5bf8b1421c756f8e2a42feaf306f9282d8e58fd5
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a strong likelihood of phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/123?utm_term=cambridge+audio+topaz+am10+service+manual In PDF document text
    • https://nebofubegifeso.weebly.com/uploads/1/3/1/4/131437549/gosukefediji.pdfIn PDF document text
    • http://topcreditscore.info/simplifying_algebraic_expressions_worksheet_6th_gradex8k7l.pdfIn PDF document text
    • http://straponartist.com/jamijodanerujaneblxejb.pdfIn PDF document text
    • http://vemasujananexu.22web.org/54063449374.pdfIn PDF document text
    • https://pixelisikug.weebly.com/uploads/1/3/1/4/131407736/43963991f5c30.pdfIn PDF document text
    • https://bevugatumuga.weebly.com/uploads/1/3/4/3/134316863/mudidimobomo-nedokojeveg-mavoxidogurij-xejujevinin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391314/normal_5ffd3b1849660.pdfIn PDF document text
    • https://lonofajizol.weebly.com/uploads/1/3/5/3/135389348/falodu.pdfIn PDF document text
    • https://mapivabivex.weebly.com/uploads/1/3/0/7/130776319/1655591.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408589/normal_5ffa79d7027e2.pdfIn PDF document text
    • http://workshop-fb.ru/ratio_word_problems_6th_grade17qm1.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://s3.amazonaws.com/tuzamada/bihar_masti_gana_bhojpuri_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/telugu_movies_free_2019_jio_rockers.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/31923017707.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/corporate_social_responsibility_companies_act_2013_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/high_performance_all_season_tires_vs_summer.pdfIn PDF document text
    • http://movozenumoz.epizy.com/napofeguj.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/how_to_install_viper_smart_start.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/make_the_road_by_walking_vinyl.pdfIn PDF document text
    • http://wamilexujiweni.epizy.com/bmw_bike_rack_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC928 5740 bytes
SHA-256: 23b2665d3eff79451937ce9ae937d190ed35405e0f42d4c78a35dde906ec5bb3
font_01_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 10228 bytes
SHA-256: 7d4c0eaaadf3275b23187bc7996529ec7e9c4fd922aa9ef7a2f24467c51b4f27
font_02_sfnt_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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