Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc8fc393ddc9e70…

MALICIOUS

PDF

66.7 KB Created: 2020-12-03 00:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa9a147a22411594f0010de08df0f96d SHA-1: 7846defe94cb7114a99e6daf8f68fdb31e11c657 SHA-256: 7bc8fc393ddc9e706cadbc998942c2f79b75cf5f8ae9bd4e513b28c4229694b0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 26 external PDFs. The primary URL 'https://traffking.ru/strik?utm_term=crestdale+middle+school+dress+code' suggests a phishing lure related to school dress codes. ClamAV detection and ML classification confirm the malicious nature of the PDF, indicating it's likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/strik?utm_term=crestdale+middle+school+dress+code
    • https://dowikonusinewe.weebly.com/uploads/1/3/4/3/134374018/duxudos-wakaman.pdf
    • https://cdn-cms.f-static.net/uploads/4379491/normal_5f8d87c0bd7e9.pdf
    • https://cdn-cms.f-static.net/uploads/4425912/normal_5fa0852c32b6a.pdf
    • https://cdn-cms.f-static.net/uploads/4392867/normal_5f9540226129b.pdf
    • https://static.s123-cdn-static.com/uploads/4471235/normal_5fc79b622d704.pdf
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f886ea5bb101.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5b75a97599144eeec634/1606376310011/vepiki.pdf
    • https://s3.amazonaws.com/gavobawum/mabafonutaravibe.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf3ca64a3cc4058a3b353/1606218703192/sahuarita_high_school_phone_number.pdf
    • https://s3.amazonaws.com/goporo/morse_sewing_machines.pdf
    • https://s3.amazonaws.com/kovezodepugov/free_app_download_on_ios.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf39a6457125654ff7052/1606284191208/65004288739.pdf
    • https://s3.amazonaws.com/temujonuwu/jatumaxi.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_off0000cbf1.bin
e8e386dc112fdcf2a4aa665f17f1ea0fdcef93dc7ad96648be25515e30cf0182
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 5084 bytes
font_01_sfnt_off0000dd07.bin
14543bb3588c6d00c9c7cffba4d19e25df4562e47b16e37b167c235aaf6a2099
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 9696 bytes