Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d9b007dcc966d2…

MALICIOUS

PDF

79.6 KB Created: 2021-01-15 05:35:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 51e09311a8e33e38191d0f1fd1c62095 SHA-1: d42cc94e1d227d43f8702d8c61e4c02e9d0b1620 SHA-256: 36d9b007dcc966d227d152cd1a7a77c1a13aa3265114827412fde754e647f5ce
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and link farms. The heuristic firings indicate the PDF is designed as a redirector and part of a link farm, likely to distribute malware or conduct phishing. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ggtraff.ru/aws?utm_term=badlapur+movie++hdpopcorn In PDF document text
    • https://cdn.sqhk.co/jebumujo/MexhaNI/dragon_quest_anime.pdfIn PDF document text
    • https://vesivugabe.weebly.com/uploads/1/3/4/8/134881415/sipoxotemerivage.pdfIn PDF document text
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/jetorerawelesapami.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/RbmgcrM/real_racing_3_mod_apk_per_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/nivurerazusa/ibUiaid/22846807334.pdfIn PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/4680471.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/35cMsje/dominos_pizza_cumbres_elite_telefono.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/ig0hgAp/39169773183.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/guxosa/aeron_chair_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/4160569882.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/david_bradford_houston.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 5044 bytes
SHA-256: 6f4291aa0eefb0131d712e895ce1a5579740a191ab223987139e2685717df1f8
font_01_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 10712 bytes
SHA-256: 68b798c68cd0a484ffb3174aa3f30b4dab6edf8a53e237f737be590989ac0152
font_02_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_03_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 2568 bytes
SHA-256: b0960530c8b2426fa7a39866fff587809cd1970d8db07bc1ede78ec3c7522223

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