Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3912f8443bac953…

MALICIOUS

PDF

68.6 KB Created: 2020-12-17 00:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42fd8b26d5f02b507a8b8c841230b2fd SHA-1: 1ef1ac67c3b2ca51c5360f02ebba4a8dd6ede260 SHA-256: f3912f8443bac953e26f2457ccb66d28fd5c68e9eb373169684d2a0d39134369
214 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'visitor guide'. The presence of numerous external PDF links further supports a link farm or redirection strategy. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/123?utm_term=seaworld+san+diego+visitor+guide
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5fd204a856885.pdf
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5f892631ee78c.pdf
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5fda8eee98d58.pdf
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/9186674.pdf
    • https://cdn-cms.f-static.net/uploads/4469827/normal_5fd662ea6b72c.pdf
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/sevogotili.pdf
    • https://cdn-cms.f-static.net/uploads/4384470/normal_5fafedc1825f5.pdf
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5fc683397631c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tojabixefova/com_tam_bi_suon_cha.pdf
    • https://static1.squarespace.com/static/5fc6ac042e537a05ef314d38/t/5fcace18a0b42e356699f7d4/1607126552900/sebetibikisamezetolusut.pdf
    • https://s3.amazonaws.com/resixexi/wamomemodirodejinadim.pdf
    • https://s3.amazonaws.com/feliso/cabela_s_african_adventures_pc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce5d.bin
da16ba948ab9de7339c1092070f77bfc62d44b8a473b549c4c7653b8c581d2b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5D 5248 bytes
font_01_sfnt_off0000e058.bin
a7fc37c165eafc92871a209fd418c1fc61ba501df2b2684ed890a857aa52b5f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 11080 bytes