Malicious PDF — malware analysis report

Static analysis result for SHA-256 5665b9b97f862987…

MALICIOUS

PDF

66.8 KB Created: 2021-03-02 01:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 38101ef8db2bfd3ea81c5fc74c5b3a01 SHA-1: 41b0bc002d549795add4db67b88b032bf0144f19 SHA-256: 5665b9b97f86298750a5a195c5f15668fd4f7fed5348650d13a163fe2deac116
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The PDF contains a large number of external links, suggesting a link farm or phishing campaign designed to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

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://midufefew.ru/strik?utm_term=jamaica+images+clip+art+stars PDF link annotation
    • https://cdn.sqhk.co/lopijikuvi/iG6gFgd/retrograde_motion_is_explained_by_epicycles.pdfIn PDF document text
    • https://cdn.sqhk.co/tatomaxeriri/eidqk9K/simple_birthday_decoration_ideas_for_baby_boy.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/homelite_gas_trimmer_carburetor_adjustment.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/ic46ief/ice_cream_blackpink_dance_mirror.pdfIn PDF document text
    • https://cdn.sqhk.co/livaxipovage/jhgjSja/nazesasaramosi.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/zuhghjn/89250063698.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/fBO7pWz/hobby_lobby_locations_in_mn.pdfIn PDF document text
    • https://duzuvopewawufos.weebly.com/uploads/1/3/4/4/134491429/4389141.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/cLjbweX/tejaduze.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedifi/3AhbYb3/school_days_android_gameplay.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/midaguvimabof/avg_pc_tuneup_2011_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/56721003235.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_off0000c79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79D 5244 bytes
SHA-256: 8d77387dad38d097ac900292b75a83d924e6838e815cdec69798efbf5d0fa1cd
font_01_sfnt_off0000d960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 10792 bytes
SHA-256: 0c5987123b904cbe9c0f58d4da80c706741b7c403af24ebee77d35bc5d050092

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