Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d66ef3bd412301…

MALICIOUS

PDF

80.6 KB Created: 2021-04-05 01:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5420126ebe8dd4a57bbca8846af9a286 SHA-1: 6c4316bd1cc5f9380f6105206edb4189c58d1a21 SHA-256: 92d66ef3bd4123018a36c2d5aaccc3f1a60ffc98282f009be087080d3fce0081
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially exploiting PDF vulnerabilities or serving as a lure for social engineering.

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
  • 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://jumiwimov.ru/wix?keyword=azur+lane+beginners+guide+2020 PDF link annotation
    • http://jukejed.mypressonline.com/vatenametobepo.pdfIn PDF document text
    • http://tamasolesodaj.mypressonline.com/54658620994.pdfIn PDF document text
    • http://warupipujamoru.sportsontheweb.net/86261362622.pdfIn PDF document text
    • https://kodiridit.weebly.com/uploads/1/3/5/3/135342100/7092917.pdfIn PDF document text
    • https://mewemevo.weebly.com/uploads/1/3/1/4/131454270/a4ff8.pdfIn PDF document text
    • http://goldstein.berlin/630138668859cnu6.pdfIn PDF document text
    • https://bozajeja.weebly.com/uploads/1/3/6/0/136082115/favenobadoxosub-somelebebev-sapubake-rubiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/vukobefebu/mgjhb8W/really_hard_worksheet.pdfIn PDF document text
    • http://weex.info/suwimofabawavamar4szc0.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/adobe_animate_full_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_60125599e2a4a.pdfIn PDF document text
    • http://hristogrigorov.com/at_voce_voltarmjncm.pdfIn PDF document text
    • http://wusokamojifel.scienceontheweb.net/buzenujegozizariwojimavak.pdfIn PDF document text
    • https://xidazujagavoza.weebly.com/uploads/1/3/1/4/131453269/017011033ae3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412388/normal_5fc7b8a7dc8cd.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/jiggfRx/10160051390.pdfIn PDF document text
    • http://instapodarok365.site/femowavatawoxf2c1f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixibedi.onlinewebshop.net/asrock_z97_pro4_cpu_compatibility.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_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 5448 bytes
SHA-256: 0696e6c0e18f2bf1e4c0cb78d7d35bd30240d4024563ae4574046c414d5c9a53
font_01_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 10864 bytes
SHA-256: 0705c815647a55a7197ca542a8e941c3cfaf91caa045747c9b56085fc2c23327

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