Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80c3040c7e4f750…

MALICIOUS

PDF

97.2 KB Created: 2021-04-08 21:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 377df91a17c14ad0578a5eec036fe76b SHA-1: 781fb97d187eeeb001de6c31719daf173df8bfd4 SHA-256: b80c3040c7e4f750653cb44723294e12e9d6d95500a46c179f8db797dbde4bb5
184 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 disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the heuristic firings and URL analysis suggest the document's primary purpose is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=seat+of+the+soul+chapter+12+summary
    • http://bofinaposo.iblogger.org/79408151864.pdf
    • https://gijagexerifaru.weebly.com/uploads/1/3/5/3/135322880/tukis_zewiwogobobe_kexijogewakusu.pdf
    • http://budivev.scienceontheweb.net/zujavujep.pdf
    • http://lugodapamaj.mygamesonline.org/31073837899.pdf
    • http://manibupefif.mypressonline.com/69376800730.pdf
    • http://mufajaku.medianewsonline.com/88773308919.pdf
    • https://cdn.sqhk.co/wobivada/ZiiqOgd/bucket_list_book_gift.pdf
    • http://latutuvifem.22web.org/76807811291.pdf
    • http://fazurusitu.getenjoyment.net/what_was_the_10_percent_plan.pdf
    • https://cdn.sqhk.co/susononuz/ijiujfi/cara_membeli_pulsa_lewat_gopay.pdf
    • https://cdn.sqhk.co/fajoliteve/Ygchaji/ecrew2_osm_no.pdf
    • https://cdn.sqhk.co/fagaxirupunu/zYidjas/96825013889.pdf
    • https://tasitonedilegu.weebly.com/uploads/1/3/5/3/135301248/9490381.pdf
    • http://nonoxutiwi.mypressonline.com/wiseguy_book_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zuvetimimu.rf.gd/grade_10_algebra_worksheets_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/7d714e9f-d467-4bfe-b158-c5ae3689fb25/34090381708.pdf
    • https://uploads.strikinglycdn.com/files/41ed1598-e9cd-4414-a8d9-746c9f4a8086/73192623583.pdf
    • https://uploads.strikinglycdn.com/files/bc1d872a-14db-42e7-96d0-0b483000977c/wibukikigurowitun.pdf
    • https://uploads.strikinglycdn.com/files/f9e92063-c27c-4bd4-a691-b0456fcc9c3f/kimufewetagal.pdf
    • https://uploads.strikinglycdn.com/files/43cc140c-eb8c-4511-9263-1ef1444765df/how_long_can_animals_go_without_oxygen_before_brain_damage.pdf
    • http://kapowuxivi.atwebpages.com/carson_dellosa_math.pdf
    • http://beliraguw.onlinewebshop.net/creative_writing_a_workbook_with_readings.pdf
    • http://bifovigavij.myartsonline.com/40158998407.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012935.bin
e84e8026b3bc3c402df8f5ae8e2008a27dd06718fb427cdf0e6ff375de93339c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12935 5644 bytes
font_01_sfnt_off00013c53.bin
97485828550b8863a60374bd039cf786e173b78fdf680371bd2f7c8d513f6e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C53 10752 bytes
font_02_sfnt_off00016116.bin
1c8bc4bf779fdf5fdd428ab6ddc6a1665d3fdc1c26b4364692bd94c1ed605b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16116 16364 bytes

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