Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c0603add006bfd…

MALICIOUS

PDF

79.8 KB Created: 2021-02-24 12:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 49c0d0c207b98383ace8ac1c47ffdfea SHA-1: 2976644ab3b766fca7d186edebff9cd400864b1b SHA-256: 64c0603add006bfd6227f17ecdbed69ba56ecd4af3ff42e0f7e4c28c520ec73f
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known redirectors, indicating a link farm designed to distribute malicious content. The heuristic firings, particularly PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM, strongly suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the nature of the link farm and the ML classification point towards an attempt to trick users into visiting malicious sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://crophysi.ru/123?utm_term=minn+kota+riptide+55+wiring+diagram In PDF document text
    • https://kobuzefejara.weebly.com/uploads/1/3/1/4/131437799/sazojatolip.pdfIn PDF document text
    • http://magicwoolshop.com/vabujineninuwarugo1nszt.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/i1icjhD/44596524427.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/hhRojiR/lego_hidden_side_bus_3000.pdfIn PDF document text
    • http://tersq.fun/fitbit_watch_faces_maker8y8a1.pdfIn PDF document text
    • http://sabujunakeves.iblogger.org/authors_purpose_anchor_chart_6th_grade.pdfIn PDF document text
    • https://rudabukonavapuk.weebly.com/uploads/1/3/4/0/134016662/3657642.pdfIn PDF document text
    • http://familyit.pro/9910272695abx5y.pdfIn PDF document text
    • http://bionatur.space/school_website_responsive_html_templates_freeb1got.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/fTOupK0/zusegakixesilul.pdfIn PDF document text
    • https://cdn.sqhk.co/dugubupa/ia7gejg/lines_zigzag_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/ijhjjbg/real_drift_car_racing_mod_apk_latest_version.pdfIn PDF document text
    • http://nibelv.xyz/sheet_music_writing_program_online59ye6.pdfIn PDF document text
    • https://zagukosi.weebly.com/uploads/1/3/4/3/134314994/6421107.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/JEhdmhj/52546427996.pdfIn PDF document text
    • https://sasadopebob.weebly.com/uploads/1/3/5/3/135324308/6641420.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/hZWhiAs/20920998592.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://momibur.rf.gd/how_to_change_daylight_savings_on_g_shock.pdfIn PDF document text
    • http://bamesidukeji.rf.gd/lanamufunemofovofokudo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 2884 bytes
SHA-256: e187c035f23e86a9156cb6a08d5844b1d5cb3592aa50ad2878597cbb389c6541
font_01_sfnt_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 5352 bytes
SHA-256: cb1397d758612bb0b90e9d8fcf4b74752659c77e413af36e1c2bcd071ca6e0b0
font_02_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 11464 bytes
SHA-256: e7f88df5d112ef09a00069b465f7df41fcb0601bf156b78bb1c3c8173748fc76
font_03_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 16060 bytes
SHA-256: 2d97eb5b8c66583654a55461b75ebc9d5954fe3bb26bfbf5761d5bfdae6bb250

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