Malicious PDF — malware analysis report

Static analysis result for SHA-256 848fad593c56ef92…

MALICIOUS

PDF

72.5 KB Created: 2021-01-04 23:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7fb49d957e86ef40e51c686226360632 SHA-1: 744141e11ae3764691d2de5a56f63402ddad15eb SHA-256: 848fad593c56ef925c3181907fb388001c89e14c50c38e2a8cf7b50ea4c3c031
214 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, indicating a phishing or malware distribution attempt. The heuristic firings confirm the presence of malicious redirector links and a link farm, suggesting the document is designed to drive traffic to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=what+is+the+purpose+of+the+declaration+of+independence+as+stated+in+the+preamble In PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/3268851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f953a4329fc3.pdfIn PDF document text
    • https://zuzolavilasobin.weebly.com/uploads/1/3/4/5/134523903/dosedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_5f994d646bd42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6418a80-1ccd-44e0-96a0-bc0fc0ac45c1/kugavazunujida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae101665-5c2d-470f-a747-a08ba11f6a5a/kusajanojaja.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/diabetes_mellitus_type_2_treatment_guidelines_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a2fa641-2821-4441-84f2-b0b4207b858a/35248898598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff51994d-4065-44e5-9e4e-593a067b8d1d/wokidosupi.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/lulisejugukumat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5dc187f-e3c7-45df-8f73-81d894f93466/sufalofudujofuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cffb62c-fee5-4c4e-a5ee-36e51f5798fd/6653427438.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_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 5548 bytes
SHA-256: 5cf861846abdf553b73d5201ceb42e37960ffe08f2e38d643b2f84519c116735
font_01_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 10228 bytes
SHA-256: e000bec93d2ffd282b06a7c917eb281839cf950c0a14f0530757a1cac56cd4fb

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