Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c9cf22054ba8bb…

MALICIOUS

PDF

105.5 KB Created: 2021-03-30 03:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a33106fac58791d41458a4aefece43a6 SHA-1: c9a3196d8e07ebc17fe6497a2d1b3bc17482462e SHA-256: 22c9cf22054ba8bbaf0d2ff3a861e62bbc11b11a6a493c5cb64630c01e883a3f
264 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://yafferge.ru/strik?utm_term=ncaa+division+2+schools+in+missouri In PDF document text
    • https://zuzumesagodufen.weebly.com/uploads/1/3/2/6/132695194/399110d3.pdfIn PDF document text
    • http://tixokapine.mypressonline.com/verodesekufarode.pdfIn PDF document text
    • https://cdn.sqhk.co/datisafapuv/bThbHOC/qr_code_scanner_app_download_tamil.pdfIn PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/2676517.pdfIn PDF document text
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/84f6477.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/fixusumup.pdfIn PDF document text
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/geselekewit-kedopomerip-gerudesasoniw.pdfIn PDF document text
    • https://sixoribena.weebly.com/uploads/1/3/4/8/134848884/3766823.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/9B6hbMV/litemudamorevavejilirev.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/cCticPk/kingdom_builder_board_game_rules.pdfIn PDF document text
    • http://kakorixow.mygamesonline.org/the_storm_kings_thunder.pdfIn PDF document text
    • https://waxukazo.weebly.com/uploads/1/3/1/0/131071095/2354547.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/77234087998.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/ZS8Tjd6/online_radio_live_nepal.pdfIn PDF document text
    • https://dotowukigirer.weebly.com/uploads/1/3/1/1/131163902/2031810.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tifavamifikas.myartsonline.com/mijovesiwajilowepawaz.pdfIn PDF document text
    • http://newurefaz.epizy.com/73085869217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a2a5be-501a-47c9-b936-1b72c58eb9d4/honeywell_6160v_keypad_manual.pdfIn PDF document text
    • http://pawulufotes.epizy.com/appvn_apk_latest_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36cea636-ecef-4f77-b7d5-891a5d2ceb70/50986540550.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_off00015b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B36 5340 bytes
SHA-256: b1aaacf22661bd62a2777f08eb5746a5295ce925cbf178ffcb37b939de61f7e3
font_01_sfnt_off00016d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D3F 12068 bytes
SHA-256: d5eb64c69236ec2825e9870dafe3c329788cf3dcc409db291020d632982d3ac1