Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fcf351694fe54a…

MALICIOUS

PDF

138.1 KB Created: 2021-03-25 07:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d54f47ad19f794512e603b451dc21346 SHA-1: 74da2fbe2c93c35411d949e4fe9dd2598bd83dba SHA-256: 51fcf351694fe54a5c5603bdad7722017e4e5e7aed37033b1479b4bee0488580
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The primary URL, https://dafemum.ru/wix?keyword=prentice+hall+algebra+2+teaching+resources+answers, appears to be a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=prentice+hall+algebra+2+teaching+resources+answers
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/sujulopomuz.pdf
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/407b2a5.pdf
    • https://bukenazupe.weebly.com/uploads/1/3/4/5/134584610/vifufanol.pdf
    • http://begetus11ppz.xyz/mukesh_ambani_profile0avac.pdf
    • http://extraevents.ru/87920758924bxvl9.pdf
    • https://siwizapetodid.weebly.com/uploads/1/3/4/0/134041585/9d00980a7eb.pdf
    • https://guwubujurod.weebly.com/uploads/1/3/1/4/131438509/134162.pdf
    • https://jinoranimewaxop.weebly.com/uploads/1/3/4/5/134528513/09cb11.pdf
    • https://tifogufa.weebly.com/uploads/1/3/1/6/131637606/2054828.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lezopobigeza/dinigipoloragovekafalif.pdf
    • http://mifedisiso.atwebpages.com/attachment_style_quiz.pdf
    • https://uploads.strikinglycdn.com/files/fb3334a5-e7de-455e-9291-3d1ff29ea582/47941949053.pdf
    • https://uploads.strikinglycdn.com/files/28189562-e578-41ac-b73f-9c1711cffeea/dungeons_and_dragons_basic_set_1980.pdf
    • https://s3.amazonaws.com/xurixado/jokupo.pdf
    • https://s3.amazonaws.com/rogugagatuf/gibivafigum.pdf
    • http://tofilijewok.atwebpages.com/95524690490.pdf
    • https://s3.amazonaws.com/fowikorejodi/beneath_your_beautiful_piano.pdf
    • https://uploads.strikinglycdn.com/files/54a1c926-a25e-468a-94a0-d7d358d9f5b2/is_powerline_safe_to_use.pdf
    • https://uploads.strikinglycdn.com/files/6225d389-b670-4f3b-85ed-d9c4b568dda8/chicco_fit2_base_vs_keyfit_30.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cfc4.bin
5e75506408ba1bf7848b65be7ee91453a39b311cdb5baf38555d400d9dc24ddd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFC4 5308 bytes
font_01_sfnt_off0001e1cf.bin
ea7e346c57d77449796e1c27eb9ac32791104e23a52da5608e1c9eb5511c9e2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1CF 11860 bytes
font_02_sfnt_off00020a1f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20A1F 4324 bytes

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