Malicious PDF — malware analysis report

Static analysis result for SHA-256 852df0a9bbc8ab83…

MALICIOUS

PDF

78.1 KB Created: 2021-02-15 13:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c20e75d9be99b4a23c4a18481de15612 SHA-1: 1a5637d21475448b0f9ecb07a5d5db273a8fe4fa SHA-256: 852df0a9bbc8ab83cfed1b8cde7232b35b5a49f8f71cabd2c2e499a5263767f4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO abuse tactic. The primary URL, 'https://baarspo.ru/strik?utm_term=how+to+open+broken+sentry+safe', indicates a potential phishing or scam lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://baarspo.ru/strik?utm_term=how+to+open+broken+sentry+safe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448727/normal_6023d0f2bb5b8.pdfIn PDF document text
    • http://bitejes.iblogger.org/soxox.pdfIn PDF document text
    • https://fapizorimuko.weebly.com/uploads/1/3/1/1/131164308/fajabalof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482208/normal_5feea02bc76fb.pdfIn PDF document text
    • https://wazivako.weebly.com/uploads/1/3/0/9/130969042/zefakikotukotipok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390095/normal_5ff1141f33438.pdfIn PDF document text
    • http://daniele.store/sanvicente_administrao_financeira9hl2g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468286/normal_5fc986397b792.pdfIn PDF document text
    • https://gakififevorejep.weebly.com/uploads/1/3/1/8/131872199/4299681.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427809/normal_60098461eadef.pdfIn PDF document text
    • https://gogodelile.weebly.com/uploads/1/3/0/9/130969080/resajekefe.pdfIn PDF document text
    • http://idealica-it.website/solekewepixetdlc6p.pdfIn PDF document text
    • http://rasazevedip.22web.org/rov_thailand_apk.pdfIn PDF document text
    • http://theharaka.online/gamuwawudigaruzuyf7mg.pdfIn PDF document text
    • http://mavpa.fun/karafun_player_25f3yy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_6029d0e2174e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn 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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 5220 bytes
SHA-256: f2f4fea0b9e7ae940d85042dd7b7d820d27631140a7d4cf47b6a4ebe027e43ab
font_01_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 6496 bytes
SHA-256: a2f49692243f3155363c265da7caa1b0710a6bf060cac491ea808d5e34e91125
font_02_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 11092 bytes
SHA-256: ee6cc0bba896c73f1d4da150fef97501f9b2622ec408cc8daaa9c4859c879e8b

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