Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe9dafb2f5c3b2a…

MALICIOUS

PDF

72.7 KB Created: 2021-03-11 00:00:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 788d43647ef29a4ad36e10cd874da9d0 SHA-1: 9a68a6dc19f292683259576a8792da76b86df537 SHA-256: bfe9dafb2f5c3b2a43280e2b08762ac41d7735e8851337422ca0398b2a29f8c9
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to technical troubleshooting, likely to trick users into clicking the malicious links.

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
  • 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://yafferge.ru/aws?utm_term=how+to+fix+dryer+not+getting+hot In PDF document text
    • http://kukushka.space/marobaluduxrodc8.pdfIn PDF document text
    • https://butiriretife.weebly.com/uploads/1/3/2/6/132681404/616885.pdfIn PDF document text
    • https://cdn.sqhk.co/pawijilabu/FUgjigj/blaze_of_battle_cheats_android.pdfIn PDF document text
    • http://1cats.space/9756011631ut5n7.pdfIn PDF document text
    • https://forexegazujolo.weebly.com/uploads/1/3/4/1/134108883/zazob-towogewuxo.pdfIn PDF document text
    • http://sneakerspapa.store/why_is_my_xbox_360_not_connecting_to_xbox_liven5fha.pdfIn PDF document text
    • https://cdn.sqhk.co/pizokifuxe/ghniihg/jusulokonumolafotimopaso.pdfIn PDF document text
    • https://cdn.sqhk.co/fusatogis/dFijlgf/19745260980.pdfIn PDF document text
    • http://gratoraama.website/42076291328btvcy.pdfIn PDF document text
    • http://lighterusb24.site/17688427625hjxwo.pdfIn PDF document text
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/ginotelufeferoji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevewodex.epizy.com/jvc_kd_r330_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/how_to_write_an_essay_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/75219725769.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/97289402682.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/pmd_brush_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/65118150471.pdfIn PDF document text
    • http://webimonok.epizy.com/49032259052.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_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 4972 bytes
SHA-256: a969783af7c9334daf1ba9fb3c547becea9e907096e4c9730713df3c824e8e78
font_01_sfnt_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 10412 bytes
SHA-256: 0fecdecf4a62191a788854b2e03d15b8ea8888624cc599648243123bf41763a1

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