Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffadd548e72944dc…

MALICIOUS

PDF

68.7 KB Created: 2021-01-16 11:12:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 388b0e499b5a4fcd28b057e19acc3be3 SHA-1: 7212a3569f040a6b89949b799fc27f95fad969bb SHA-256: ffadd548e72944dc4e12caffc3fae4a134d52b5f58c8a2b4c8469c481be286a7
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 known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

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://traffking.ru/aws?utm_term=grizzleheim+main+quest+guide In PDF document text
    • https://site-1196795.mozfiles.com/files/1196795/pet_paradise_bubble_pop_matching_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485157/normal_5fd1ca073ff23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_5fba182972481.pdfIn PDF document text
    • https://site-1180705.mozfiles.com/files/1180705/30568312472.pdfIn PDF document text
    • https://xovixonu.weebly.com/uploads/1/3/4/8/134896571/nidivujeku-belijol-rixuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418167/normal_5fe9ae57120a0.pdfIn PDF document text
    • https://digewulafi.weebly.com/uploads/1/3/4/8/134882869/6234.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fovezewi/xanofawapibafu.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/architectural_lettering_styles.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/browser_for_android_tv_box.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/julutipinetib.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/55561045493.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/hollywood_reporter_newsletter.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/24208332095.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/android_10_nokia_7._2.pdfIn PDF document text
    • http://ift.tt/eA8V8JIn 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_off0000cf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF76 5448 bytes
SHA-256: 866d27eccf44d4966e836d26249908e6dfa28b0a61db7151aac8431791e25ce9
font_01_sfnt_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 10708 bytes
SHA-256: 97527d85e268d8a4605080fcebdec9545bf68c3bd5d1c00fa79c62c7af3c7fbe

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