Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b96bd3560ab676…

MALICIOUS

PDF

68.6 KB Created: 2021-03-19 03:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18428e6111ba1adf10ec58ec933f608d SHA-1: ba3704fd4ee3df8df7025d380b19aef1944ed83a SHA-256: 48b96bd3560ab676a900998660c2a4daa92725e8ea5c2f7dcf9e1ec123f41b77
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though partially garbled, suggests a lure for downloading content related to 'Ugly's electrical book 2020 pdf download'. The presence of numerous external URIs, many hosted on disposable domains, further supports a phishing or content-luring attack pattern. No scripts were extracted, but the PDF structure itself likely facilitates the redirection to malicious URLs.

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
  • 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://dugedepap.ru/aws?utm_term=ugly%2527s+electrical+book+2020+pdf+download
    • https://cdn-cms.f-static.net/uploads/4450502/normal_5fd9694b1da64.pdf
    • http://kulinar2020.site/859384301592upik.pdf
    • http://vubitim.sportsontheweb.net/25036251566.pdf
    • http://revilokepudidu.mygamesonline.org/83557941761.pdf
    • http://dowedunazab.iblogger.org/lijutemugudulevu.pdf
    • http://idealicaitalia-ufficiale.site/toro_lawn_sprinkler_solenoid_valves8nwwf.pdf
    • https://cdn-cms.f-static.net/uploads/4470224/normal_604cd0861f792.pdf
    • https://cdn-cms.f-static.net/uploads/4503874/normal_60480bcc490c0.pdf
    • http://opensalon.xyz/mifosupawogilijefo2hpb5.pdf
    • https://static.s123-cdn-static.com/uploads/4375894/normal_5fcba601c29e1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_2b25d556731f42458d4b36ca116d4fc3.pdf?index=true
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_2e45a38fd1974ac6b27a1d70c96b7241.pdf?index=true
    • http://nejesezape.myartsonline.com/35824337505.pdf
    • http://nowaginog.epizy.com/gulixemejujowuju.pdf
    • https://s3.amazonaws.com/zizene/46917717783.pdf
    • http://manuwakagekewu.onlinewebshop.net/99799000889.pdf
    • https://s3.amazonaws.com/sorapobuk/the_little_prince_audiobook_free_download_mp3.pdf
    • https://s3.amazonaws.com/kotodur/anomaly_detection_using_machine_learning.pdf
    • https://s3.amazonaws.com/pibabopuduj/malwarebytes_anti-_malware_for_mac_link.pdf
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_42d2ac21795d4fa08d77dab4da4bf240.pdf?index=true
    • http://sobibuxasegisun.rf.gd/free_html_website_templates_2018.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c918.bin
908eb748136ba4028e34f06986841c0537dc5567358aba56f34c464621e889fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC918 6020 bytes
font_01_sfnt_off0000ddc8.bin
31cb25a3c51ea38c2186338fc2974f1d83f94b288ff5efa9aa9af60ec6c8b18c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 10872 bytes

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