Malicious PDF — malware analysis report

Static analysis result for SHA-256 621db792ed0ee437…

MALICIOUS

PDF

89.2 KB Created: 2020-12-30 03:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5d85434c04a415ffb79109b2deb73b85 SHA-1: dc77551b641915b9a03b41710fd8f8c627189fc1 SHA-256: 621db792ed0ee4370ed61bf861c704b1c68ba6c7468bb00d417e39bc35c14775
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic firings indicate a link farm designed to redirect users to malicious infrastructure. While no scripts were extracted, the presence of embedded URLs and the ML classifier's high confidence suggest a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=electric+man+2+unblocked+games+77 In PDF document text
    • https://cdn.sqhk.co/wunokebewoz/YKvhggg/40357032423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489977/normal_5fd28fdf09364.pdfIn PDF document text
    • https://fejovixojik.weebly.com/uploads/1/3/4/3/134333762/kulufifulume_vaneguxakiwi_susari_lurifaf.pdfIn PDF document text
    • https://cdn.sqhk.co/gajerivab/ggSjggg/kegupavipesewujadazed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8eba645-c69c-44f6-a54b-554ae4ba0e5f/dumijugeto.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/sasiwadanoxir.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/54672171869.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/accept_invitation_formal.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/broadcast_news_story_script_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/life_cycle_of_a_dragonfly_for_kids.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/one_way_anova_using_spss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ed9ae1-7c16-4737-9981-a8503c3078d9/42394787452.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 5632 bytes
SHA-256: c5dd876ea6cbb5bc021a263a4648fad5beabfff2060147228d16e418c3b37e3e
font_01_sfnt_off00011952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11952 11996 bytes
SHA-256: 6c6c4b0abc9cf05fb7d512f1286b061da4a9a0adceb349f6aeb1307761dd827c
font_02_sfnt_off00014261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14261 16192 bytes
SHA-256: c00f55c8a23f8fc12478e3e4ea1bac713d25e4d1dd6e1e4bb5c667610ba6b2cf

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