Malicious PDF — malware analysis report

Static analysis result for SHA-256 c233ac3b3a8e140b…

MALICIOUS

PDF

72.6 KB Created: 2021-04-28 09:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 12948b0deace3e564fd99348fdd759eb SHA-1: f2544f3fb168fa3d5e674f7defeb65f6c436acc4 SHA-256: c233ac3b3a8e140b65020afdb2bfe32e199aaf1bea173cfd0041d83e2078b7d2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://jacksth.ru/strik?utm_term=fedex+bridgeport+wv+hours PDF link annotation
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/jolutawumukisu.pdfIn PDF document text
    • https://bekobivovovezu.weebly.com/uploads/1/3/4/6/134608345/kobudikip_vufefewifuza.pdfIn PDF document text
    • https://zogolobogin.weebly.com/uploads/1/3/4/6/134690222/d5b713f1.pdfIn PDF document text
    • https://wimaxexuxiwob.weebly.com/uploads/1/3/0/8/130874544/0d19b8fddf.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/a9baeb57ab.pdfIn PDF document text
    • http://numulul.mygamesonline.org/skyrim_xbox_one_mod_load_order_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408879/normal_5ff01a97621d3.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/99494032482.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/how_to_change_time_on_dsc_alarm_panel.pdfIn PDF document text
    • http://dupuladusudired.mypressonline.com/noun_forming_suffixes_worksheets.pdfIn PDF document text
    • https://rasegopejut.weebly.com/uploads/1/3/4/3/134317160/ledek-zafelumo-jamawetisuw-xotopabu.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/5_minute_charts_technical_analysis.pdfIn PDF document text
    • http://zozitaze.mypressonline.com/92204305219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5fd9acc0286f9.pdfIn PDF document text
    • https://geripipo.weebly.com/uploads/1/3/4/3/134371036/8245202.pdfIn PDF document text
    • https://pavufunipuz.weebly.com/uploads/1/3/4/2/134265556/aa87ca8aee4cfc0.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/9134188d-1b8b-4344-9766-1124ead9ed06/was_marbury_ever_appointed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36656560-a7bd-42a7-a925-9b531416caf1/57725090493.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_off0000d002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD002 5072 bytes
SHA-256: e3fc2199574ebcb501b5985eae3a634d34a5c10347c7af432fd8b4df2a8e4919
font_01_sfnt_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 10680 bytes
SHA-256: a4ad4d09a93172e6b66b365d4d9ea90e4390b92b39d6bceb3e33b89da7520678
font_02_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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