Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8c73a9219d98e7…

MALICIOUS

PDF

73.8 KB Created: 2021-02-07 06:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1086b7dd2ef9eb1b85fc1a21fdfc46f2 SHA-1: dcc8f6bae6c17b6a813d80914ea103afbca7bd67 SHA-256: 7f8c73a9219d98e70604df554ee72b2e423536522bfa719ab20850507376b04d
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or redirector document. It contains a large number of embedded URLs, many pointing to disposable hosting or known redirector infrastructure, suggesting an attempt to distribute malicious content or phish for credentials. The presence of a malicious redirector link and a link farm further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/123?utm_term=university+of+virginia+school+of+law+admissions In PDF document text
    • https://static.s123-cdn-static.com/uploads/4425909/normal_5ff4d52703006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393502/normal_6004f7c776913.pdfIn PDF document text
    • https://biziremidawa.weebly.com/uploads/1/3/5/3/135397591/96071a.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/jqxhhvQ/wokejedalize.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/74c919ab1.pdfIn PDF document text
    • http://pixell.store/32_viral_video_ideas_for_busy_musiciansirov4.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/ajp51jb/12459216716.pdfIn PDF document text
    • https://cdn.sqhk.co/bozogekeji/hVHhddr/.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/gKLrSgf/transport_tycoon_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/PEhd6Ow/54980851049.pdfIn PDF document text
    • http://verifedform.com/babette_s_feast_full_movie_freedhsdz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5fd6531520595.pdfIn PDF document text
    • http://rp-youtube.fun/spanish_word_of_the_day_app_iosj00s1.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/suxiweke/laudate_dominum_mozart_sheet_music_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/27140531095.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_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 5680 bytes
SHA-256: 00eb137b328199e5d1a42ae76628f0e613d5327844ae7dcefda4e793f35fa22f
font_01_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 12220 bytes
SHA-256: 593ed86f6254f044c4b1cfd5ce20b6d33ef337c9f5e18950a0ec949360cab8a3

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