Malicious PDF — malware analysis report

Static analysis result for SHA-256 52256d6662dd9d3a…

MALICIOUS

PDF

82.2 KB Created: 2021-05-31 01:40:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fcad97ca1d6371fa07f885636e97b529 SHA-1: 41b13fc26de818a4fa784e772b2eeb111d6ab37c SHA-256: 52256d6662dd9d3a025ec6021d9def51d03f495f904631d8ee3342d225d5bca5
156 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains a large number of external links, with the primary URL being https://kuzutuzo.ru/strik, suggesting a phishing or SEO spam campaign. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for malicious PDFs to execute actions or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=digital+marketing+study+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377116/normal_604b922fce173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490539/normal_5ff09752b6b57.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4498376/normal_60b30003b889b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482402/normal_60228336c538b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_6063643fc967e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5fca33da76516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_604f32a544b70.pdfIn PDF document text
    • https://dovowufola.weebly.com/uploads/1/3/4/4/134438787/141596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_6009d2dd695db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_604349e03194f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_600b3ad02a25f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_60110bb873f9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476780/normal_6012d6188cc00.pdfIn PDF document text
    • https://nakakikixug.weebly.com/uploads/1/3/4/4/134490848/d188bbc270.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422620/normal_5ff0f23e465cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482860/normal_606a2df52db78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_602206355f31b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386842/normal_5fe3dee38a4f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487191/normal_603f98e6a6b96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_60285e7528b96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_6049349184c1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409628/normal_5fdc14278dd7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 5524 bytes
SHA-256: 91374e757ec11e1f75d406c63e35855e767212b25b2c14fc450f5d8267d30afb
font_01_sfnt_off00011652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 10940 bytes
SHA-256: 32dd5bb31a212b833b3e945f251f2dac7734be0c1a53ec99f3c64f12e41a0828

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