Malicious PDF — malware analysis report

Static analysis result for SHA-256 6613d87c26861762…

MALICIOUS

PDF

76.4 KB Created: 2021-01-21 15:32:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7c3de3c1c3879e4c4df344a6ce21ead4 SHA-1: ef7bf1a7fe71ea7f9cc917d6b4abdf25ab6f4b10 SHA-256: 6613d87c26861762237462f2b533b4aee96875ed78d8db94250c3b712f0add64
214 Risk Score

Malware Insights

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

The PDF contains a link to a redirector that appears to be part of a link farm, likely intended to distribute malware. The document body, though heavily obfuscated, contains text related to downloading a game mod, suggesting a lure. The presence of numerous external PDF links further supports the classification as a malicious redirector and link farm.

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://ggtraff.ru/wb?keyword=download%20bowmasters%20mod%20apk%20versi%20terbaru In PDF document text
    • https://static.s123-cdn-static.com/uploads/4367299/normal_600537d49cb5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496153/normal_5fde9d967e5f3.pdfIn PDF document text
    • http://lamomusexosefe.66ghz.com/41393562323.pdfIn PDF document text
    • https://wimiwimevodozaz.weebly.com/uploads/1/3/0/8/130874111/jidurudos-jujuwezugigetef-tobizixugopulu.pdfIn PDF document text
    • http://bowoporoj.iblogger.org/free_cribbage_board_template_s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368494/normal_5fcca760ef6db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490918/normal_5ffb7bd118d3a.pdfIn PDF document text
    • http://zupedaganivo.66ghz.com/anorexia_nervosa_articles.pdfIn PDF document text
    • http://pusedoropeseb.66ghz.com/75283159521.pdfIn PDF document text
    • https://vagenovujod.weebly.com/uploads/1/3/1/3/131398358/godiwe-jewamepaxete-tineriruzutevix.pdfIn PDF document text
    • https://site-1177446.mozfiles.com/files/1177446/18361513108.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vemixizafij.rf.gd/54627656288.pdfIn PDF document text
    • http://tosodesuvivat.epizy.com/british_comedy_guide_podcasts.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/kelezazibij.pdfIn PDF document text
    • http://doveweluzabakiw.rf.gd/fsis_usda_appendix_b_guidelines.pdfIn PDF document text
    • http://zasidad.epizy.com/categorical_data_analysis_2nd_edition.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_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 5460 bytes
SHA-256: 3903c3a5b336b65ccc6af312c7a2cda92ff9096099356a56fb70222e08894083
font_01_sfnt_off0000fefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 10884 bytes
SHA-256: d7bc02a6aad86ff3badfb3bc85a6b355a6d084ae0a3c1d7da1651ef5e489088a

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