Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20a7e9234f467a8…

MALICIOUS

PDF

78.7 KB Created: 2021-02-18 20:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c6c6623450e424a6f5c8f8b8fee6d912 SHA-1: 2689a0e3f4e41f139bd0dfb775ca96fc7ddb9665 SHA-256: f20a7e9234f467a8f1545041ebc4198354c55486c78e6fe00e4fd46a3c1d6671
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://druttle.ru/wix?keyword=harrington+on+cash+games+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/nojedajoze/hWXVFQ8/mazes_free_printable_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/jz8geij/birthday_cake_recipe_not_chocolate.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/giBGfhg/67632924924.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/5bhijg8/software_videosorveglianza_wifi.pdfIn PDF document text
    • https://cdn.sqhk.co/tukutabu/tAyghhf/haunted_heartbeats_horror_otome_romance_novels_mod_apk.pdfIn PDF document text
    • https://mifugitosa.weebly.com/uploads/1/3/4/6/134631290/gibubolur_lelatiwavufabos_dosijanajezoto_lemum.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/jexodub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455642/normal_5ff964fba5da4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_601b48edbf17e.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/hglf1jd/71637589595.pdfIn PDF document text
    • https://rezawefid.weebly.com/uploads/1/3/5/9/135978206/minelej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465555/normal_5fec2f3f6dc94.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/viboxikuz/ucsf_irb_consent_template.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/96033435784.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/31133461210.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/56625796865.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/chemistry_foundations_accuracy_and_precision_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/75720373908.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/runejizedogo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 5624 bytes
SHA-256: dfd272a26ade0b92b1069073e81b468cfa14ee21b8ce79bfc2b1d91341eee2fc
font_01_sfnt_off000109fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 10444 bytes
SHA-256: 2bf3d80390dacdd1dd41060296339a8abade4428ee14a9c879ea279bc83008c2