Malicious PDF — malware analysis report

Static analysis result for SHA-256 3670ae84d583f99f…

MALICIOUS

PDF

73.1 KB Created: 2021-02-15 06:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 36941f05f543d9e896b341d67f14f9b0 SHA-1: 23e1a406779143b431a9266ac885faa637946214 SHA-256: 3670ae84d583f99f45949778a18e57a19c5544e036fd1e99136edb2d0e180a5f
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 pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious lure.

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://jottigo.ru/wix?keyword=scan+lines+on+tv PDF link annotation
    • https://cdn.sqhk.co/jolodovi/Pghagdi/arcade_ball_3d_games_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484990/normal_601da68587c52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376601/normal_5fdeebd451a86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409806/normal_6007cbbb1ead1.pdfIn PDF document text
    • http://lnstagram-helping.live/11285315522v9lia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_5fe7cdbe4f632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_60247e45ce8cb.pdfIn PDF document text
    • http://citimart.online/wagamama_takeaway_menuiuo1k.pdfIn PDF document text
    • http://voirop.xyz/fesojidobefyz.pdfIn PDF document text
    • http://francobusiness.com/multifactor_leadership_questionnairemvxcw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464739/normal_5fd36937e8e9d.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/11336288540w306f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476750/normal_6029cdd8cfe58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_6016e02178088.pdfIn PDF document text
    • http://winsbig.space/amiga_3000_kickstart_romf24bc.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/bomivejovu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449616/normal_5fc798e8ea6a1.pdfIn PDF document text
    • https://kobuvedubi.weebly.com/uploads/1/3/4/0/134017802/4742757.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
    • 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_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 4648 bytes
SHA-256: 5398b913ae0e3c146b6b66f42ef99e66a7d96229befd8136da988b5454dc326f
font_01_sfnt_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 10316 bytes
SHA-256: d11aba603a268260c71c3307f9e6a5265d72fffa993f8e9d434e83e64197b8d1
font_02_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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