Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af1098e538fe545…

MALICIOUS

PDF

72.0 KB Created: 2021-04-14 09:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ed76d979476243adc7972982c1e6443 SHA-1: 79ce1eab55b0f437bfa0aab0f39655ba0935ae7e SHA-256: 6af1098e538fe545aa253e452d0440a91e167e28a5de4867c65fd899b4b677ab
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One prominent URL, 'https://resalured.ru/strik?utm_term=stock+market+open+time+christmas+eve', suggests a lure related to stock market information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm points to an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=stock+market+open+time+christmas+eve
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/dirofane_zibafinafaf_golujiti_bideluganasiju.pdf
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/30e5f4f9.pdf
    • http://kurixuj.sportsontheweb.net/45292100344.pdf
    • https://zefisuket.weebly.com/uploads/1/3/4/8/134868467/xonuzowoxunip.pdf
    • http://morasuxod.getenjoyment.net/vasipavemositetonetoxofir.pdf
    • http://wodekenizowa.getenjoyment.net/viktor_frankl_biografia.pdf
    • http://xulutiperaraki.22web.org/cement_brick_making_process.pdf
    • http://pubofumoxo.scienceontheweb.net/32069987464.pdf
    • https://vefapabawi.weebly.com/uploads/1/3/0/7/130740427/fotanebonelizosa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_acfd351d786041b0a9953e133b61dbca.pdf?index=true
    • http://kijonag.onlinewebshop.net/17497636353.pdf
    • http://suvokejixu.epizy.com/jeguwutonatejesux.pdf
    • https://uploads.strikinglycdn.com/files/f1abfc54-7ef4-4332-87d2-aa54c4b38344/gorewut.pdf
    • https://uploads.strikinglycdn.com/files/13706d35-3d18-4c43-962f-d8c4872c740e/51019374081.pdf
    • https://uploads.strikinglycdn.com/files/79cb634b-52f1-43db-8788-f32f2a749d93/99632328352.pdf
    • https://uploads.strikinglycdn.com/files/ce84470f-9b27-49a5-aabb-16bd166bc6d3/what_does_hebrew_mean_in_greek.pdf
    • https://uploads.strikinglycdn.com/files/1c9e30c8-eccc-446b-9825-8c6b0cbbdb85/zidaru.pdf
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_2c8ef4c58eb04f51b0758c6841dc7b5f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd0d.bin
68715815bc08bca37dd803e3c3717920d2a0fe60974fca907bdcd4371fa5057a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 5368 bytes
font_01_sfnt_off0000ef2a.bin
1149ff6c3db38ca5de4ea2c59478251f041fac5650871db9938233d33f125c79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 10512 bytes

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