Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3d0014d788e533…

MALICIOUS

PDF

70.0 KB Created: 2020-12-20 20:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2f1b251153978c9bb24dc198d3db214f SHA-1: a2f6e49b7174f251db607ae2f4a41c589577ceed SHA-256: ab3d0014d788e533c1a04399a39f6774ac827d5c036809819d5e9c9d1e4408da
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains links to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/strik?utm_term=comparing+3+digit+numbers+worksheets+pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external PDF links, suggesting a tactic to distribute malicious content or engage in SEO manipulation for phishing. No scripts were extracted, but the presence of malicious links strongly suggests an intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ggtraff.ru/strik?utm_term=comparing+3+digit+numbers+worksheets+pdf In PDF document text
    • https://liwojugimigazip.weebly.com/uploads/1/3/4/9/134904469/netazivig_xagebokipebeg_zojelefog.pdfIn PDF document text
    • https://sazefowefojewen.weebly.com/uploads/1/3/4/8/134893887/keguzatozewisa-wulijuzilolu-xibopomako.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4764d3c0-2647-4d9d-8e79-884a8565c656/baker_furniture_outlet_kohler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7576feac-4df8-4989-9fa5-d61cea55c00e/free_south_carolina_travel_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52b4381-163f-4627-b16d-941e21fa371f/gejuwomepimakidakuvab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/667ebf25-9712-410d-a60a-e6f61ac5db42/losasakumu.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/durumerejo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc576fe6609fd0ee7b05742/t/5fcb6dfbda45e86ccaa35f9a/1607167483387/faxejexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/485a8aa2-6ac3-4b16-a89b-d2b1fedd0e26/rubirokiwope.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6cc8f9d43d906ac099289/t/5fd0ea94d700412444cd813f/1607527061663/muviweganam.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1f57d2806c62ec20050a/1606229847508/80715856170.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf0e279c08c7f2b9da255/1606217955290/michael_buble_wedding_songs_everything_lyrics.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fde7a645fb7d01a9b07559e/t/5fdf9b5b459323513be55ff9/1608489819955/cheap_black_platform_high_heels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1af5b11-69f5-4434-947c-122a5cd2b239/83478928114.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72F 5788 bytes
SHA-256: 6c7848858546aef9379c7f39649184c34724b9171202b879f9326f9588786073
font_01_sfnt_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 10016 bytes
SHA-256: df26c2da75015faac1f68808e5bc298a489fab26f5d0cd8874a00953ecf9d897
font_02_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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