Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcce1c94e088be24…

MALICIOUS

PDF

79.7 KB Created: 2020-12-17 11:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 551cdeb59ac8e8631d982ccfed089d3b SHA-1: 9ac8055aa44874fb2ceb44e33611324e52f1b5cb SHA-256: fcce1c94e088be24ac70857cbadc44d131ec4d90b1677ba8b7ce925e1fb7dc39
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The presence of a large number of external PDF links, some hosted on S3 buckets, suggests a link farm or a method to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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=lg+g+pad+4+case In PDF document text
    • https://jepirozo.weebly.com/uploads/1/3/4/4/134474462/b04e6f2a2.pdfIn PDF document text
    • https://jowamevo.weebly.com/uploads/1/3/4/5/134511132/a808eacfd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_5fb726560eb58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461245/normal_5fd159184927a.pdfIn PDF document text
    • http://www.danawa.com[http://www.danawa.comIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/robeteladuwukined.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/voxosuwitudega.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/23733622658.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/bitwise_asset_management_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/crown_of_sorrow_raid_exotic.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/best_violin_brands_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/wedding_background_hd_wallpaper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/38911929433.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/76586128582.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B0 16568 bytes
SHA-256: a1bacb7629094ce33da0b23971b7dadc2c1eb2e9e8594250b3c3f0431fc33b1e
font_01_sfnt_off0000fa63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA63 5140 bytes
SHA-256: 107ceb57ed74d2ed3effffe184176d9fe002c81226c8d8a6159cd4d9082933aa
font_02_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 10968 bytes
SHA-256: f4a31685f98c5cab1b14cfbef557798b67ee11a2ebe80b6e1a8f1b4cf801a24e

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