Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5a88685f463479…

MALICIOUS

PDF

80.0 KB Created: 2021-03-03 17:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dcef93a66fd74018e2e2c1d2a1b39cfa SHA-1: 567bde0f5bd8f68ca3e3f56836b19ed5f911d859 SHA-256: 8e5a88685f463479dc139a774391814b8e83ec46a92eb82300dfc9cf6c1e1faa
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically referencing 'how to get adobe photoshop free for students', indicating a phishing or scam lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to distribute links, likely leading to malware or phishing sites. Although no scripts were directly extracted, the PDF structure and embedded links strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=how+to+get+adobe+photoshop+free+for+students PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426407/normal_5fda0d2c26ff7.pdfIn PDF document text
    • http://siondez.ru/baby_monitor_with_phone_app_and_screenydz3c.pdfIn PDF document text
    • http://liwexun.mywebcommunity.org/53095385110.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/reseboraf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383322/normal_5fcea76f0594c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490539/normal_5fdadab756ca3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501993/normal_602089ad98db5.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/26119154228.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://winavetipi.epizy.com/deep_link_android_react_native.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/can_emdr_help_adhd.pdfIn PDF document text
    • http://gubogur.rf.gd/suwokopoxunozane.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/kasoxamukeluvife.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_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 5464 bytes
SHA-256: a81e812f0413564918b612b826d02d53a9c2559d716fffc522fdc5359e6d21cf
font_01_sfnt_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 10532 bytes
SHA-256: 9c2141ac6738d03c682db074aff76be7b1076b811d8fecc3ab93b9c972f9e5f8

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