Malicious PDF — malware analysis report

Static analysis result for SHA-256 64871d308c79eea4…

MALICIOUS

PDF

76.1 KB Created: 2021-01-26 00:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 087186ddd3e5a1f475817b682c7a09f3 SHA-1: b8d301caa96de9f8f6cce2f7eb86964d47c83cfd SHA-256: 64871d308c79eea4edaf45794d2a6a2ca7b66163f9021e65ce882ded5a9263e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the overall structure points to a malicious PDF designed for initial access.

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://trafficel.ru/123?utm_term=linda+sue+park PDF link annotation
    • http://remontlegko.info/spirit_rider_1993_trailer5exlc.pdfIn PDF document text
    • http://zasaluto.iblogger.org/kanevifemizulizikuzud.pdfIn PDF document text
    • https://modulofironufi.weebly.com/uploads/1/3/4/4/134402713/3194487.pdfIn PDF document text
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/5063150.pdfIn PDF document text
    • http://luchdobro.site/bazigonerigamaxusaxowafarw0je.pdfIn PDF document text
    • http://lovelid.xyz/262048146708yf57.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/7247192.pdfIn PDF document text
    • http://daduriwikoniza.22web.org/75621012005.pdfIn PDF document text
    • http://olipaka.xyz/cheats_for_sims_4_pc_make_happy65zrd.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/rokuwapesu/dikakobabarunakujije.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/uc_browser_update_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/juxiduwotujow.pdfIn PDF document text
    • http://torumaxot.rf.gd/always_on_display_samsung_a10_apk.pdfIn PDF document text
    • http://gobofitis.epizy.com/98844335483.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/93498530649.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/59083984134.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/ischemic_heart_disease_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/maruzidezuwedigepoditowu.pdfIn PDF document text
    • http://jiwepatifon.rf.gd/wabirugabajanijibup.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_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 4928 bytes
SHA-256: 6b7dd01568c93257bb652f6e74234ab60cdb04c3b750e40196f8a0ea69ec6cf2
font_01_sfnt_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 11108 bytes
SHA-256: 0572ba6ac2011be24f37195ccbc00b3a183c7b8db74f85ad84645ca2ec346fdc

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