Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eedb1d9d4907da8…

MALICIOUS

PDF

80.6 KB Created: 2021-02-17 16:30:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 568a2037d737f289123e7f5c6308bf3f SHA-1: 5626a4d95887724ad4b419abc802890d02319838 SHA-256: 3eedb1d9d4907da8f371e674af6a7282293e603a56a379280418145006bb82fe
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files, a technique often used for SEO manipulation or to host phishing content. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the document as a link farm. The ML classifier also strongly indicated maliciousness.

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 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://yafferge.ru/aws?utm_term=dan+simmons+hyperion+synopsis In PDF document text
    • https://cdn.sqhk.co/muluxodipoto/Hiabjah/libafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464524/normal_602b2d557126b.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/SYjcYxF/best_friend_quotes_in_english_for_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/ZjdghHK/kineg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491169/normal_600f596ead7e1.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/iiwsHjg/football_2020_season_stats.pdfIn PDF document text
    • https://cdn.sqhk.co/rifebonapesi/h8jinyn/zupugadida.pdfIn PDF document text
    • https://cdn.sqhk.co/wafixagi/jxifia3/17336643621.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/ijn5icq/beat_my_boss_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/ihe1Yha/10970697830.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5fcff5d511001.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/d92d0eb7f51b98.pdfIn PDF document text
    • https://lodotimafigu.weebly.com/uploads/1/3/5/9/135981467/99f3f1b.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/dKuB9JX/skins_season_5_cast_franky.pdfIn PDF document text
    • https://cdn.sqhk.co/xotolodi/gdjjghL/bombshell_movie_cast_1933.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/bwpwFOb/tirijawewilegit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 5128 bytes
SHA-256: 98ab1019154f7067e5972e7bbcf7af542a35b2d52ab3f8c156287d5ee05c5c2a
font_01_sfnt_off00010f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 11032 bytes
SHA-256: 4c50d21efe31b644cf86a04782a6ad30dc1d602059b60da0754b9ec2426643a7

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