Malicious PDF — malware analysis report

Static analysis result for SHA-256 994b6483c5c24077…

MALICIOUS

PDF

77.0 KB Created: 2021-04-08 03:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fcf4be76eb1b63c62b27243cf23de171 SHA-1: 55966c1e150233d0e8744ce48b82f208bfbf3fda SHA-256: 994b6483c5c24077c582a6b10910930b04a5d02556f4cd37ad08aec9290364c4
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/123?utm_term=driver+updater+for+windows+7+free PDF link annotation
    • https://ditixalopu.weebly.com/uploads/1/3/1/4/131410538/watogakisunet-fuzeperon.pdfIn PDF document text
    • https://fufejaxogepevi.weebly.com/uploads/1/3/4/4/134485438/6f229a49064.pdfIn PDF document text
    • http://lafovug.iblogger.org/41139935563.pdfIn PDF document text
    • https://bamiwesuwo.weebly.com/uploads/1/3/5/3/135390748/jogas_gusenegaxopopu_razifudu_sozosatevaguko.pdfIn PDF document text
    • https://limejanokevipa.weebly.com/uploads/1/3/0/7/130739330/4732180.pdfIn PDF document text
    • https://bizunasudene.weebly.com/uploads/1/3/5/3/135345394/tasegogefufezadojug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485926/normal_5fcd57ee2ef1f.pdfIn PDF document text
    • https://famuvotatag.weebly.com/uploads/1/3/0/8/130813835/wapib.pdfIn PDF document text
    • http://rozapunu.22web.org/didaxetokagap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369166/normal_5feede9782075.pdfIn PDF document text
    • https://bejixetixozivi.weebly.com/uploads/1/3/4/4/134499198/14e7944ce.pdfIn PDF document text
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/vizalurebeweti.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://s3.amazonaws.com/xoxaneral/sudotoza.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/block_strike_mod_apk_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/watoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2b2cb1-f1fb-4700-829f-721f151bacde/sotemobije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8036c43-3d7b-4985-85c3-7a3074bf0afa/8975146895.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/1001_arabian_nights_stories_free_download.pdfIn PDF document text
    • http://fuxodenajakifut.epizy.com/fisher_funds_kiwisaver_annual_report.pdfIn PDF document text
    • http://woruvanite.rf.gd/action_verbs_picture_cards.pdfIn PDF document text
    • http://bibubebe.rf.gd/2005_dodge_durango_repair_manual.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_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 5116 bytes
SHA-256: c7dde0f7f227200b6c0787e3a2586f934c7ba3525141c885985c336e6fe32ead
font_01_sfnt_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 10456 bytes
SHA-256: 2c8c339b4d4450c03ccfbf9f73ade085f99cc0bff194fea7bda20648bcad7f1b
font_02_sfnt_off00011869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11869 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2