Malicious PDF — malware analysis report

Static analysis result for SHA-256 4455eb8d92ff6154…

MALICIOUS

PDF

72.4 KB Created: 2021-01-14 23:00:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dd568507882f37d182499cc6a0a99dca SHA-1: 6088ee60d3a645cc3e2e1329413d338ea0465700 SHA-256: 4455eb8d92ff61546267d59970c7c9f2e5158563b721580d3caddcdfe3c6f5d4
184 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 firings indicate the document is designed to redirect users to potentially harmful sites, and the ML classifier strongly suggests malicious intent. The document body, though heavily obfuscated, contains references to TV show episodes, likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://traffking.ru/aws?utm_term=brickleberry+season+3+episode+10 In PDF document text
    • https://cdn.sqhk.co/gotakavapu/ibhjGjb/interstellar_2008_script.pdfIn PDF document text
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/fosiluxika.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/MXhdXZi/the_chosen_cast_eden.pdfIn PDF document text
    • https://site-1190334.mozfiles.com/files/1190334/speed_racing_ultimate_apk_download.pdfIn PDF document text
    • https://site-1177606.mozfiles.com/files/1177606/jusinidu.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/iggggic/uno_tm_friends_download_apk.pdfIn PDF document text
    • https://site-1175981.mozfiles.com/files/1175981/durekamagaji.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/sodokazid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379049/normal_5fccbc5aac5be.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/jajifha/sibi_bale_stunt_driver_ford_vs_ferrari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413113/normal_5ff23feace4b9.pdfIn PDF document text
    • https://cdn.sqhk.co/sisuriwul/ctZhhgj/zivate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zugutixe/healthcare_center_at_the_forum_columbus_oh.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/pejovegilokazagu.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_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 5780 bytes
SHA-256: 7d70eed62b6de8d64bcf86081a9cc47849a6e4060f3184fcfe8a2217f3f744ff
font_01_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 11092 bytes
SHA-256: 80d76a1298f312780532741ef3babc43ef24bd324c61b71b6106e1702f6feb02

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