Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7ea2d7a1033894…

MALICIOUS

PDF

127.4 KB Created: 2021-01-11 21:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: de413fcd87580a6b73180589d28ce93a SHA-1: b560d5d09935b0dd1f72f50013e13bbc6187049a SHA-256: 8e7ea2d7a1033894daec365f9ca7bfe123c950d39855ca8f0349a567933e62e8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded document body text appears to be corrupted or obfuscated, preventing a clear understanding of its direct content, but the heuristic findings strongly point towards malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://traffset.ru/123?utm_term=twelve+patients+life+and+death+at+bellevue+hospital+by+dr.+eric+manheimer PDF link annotation
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/fdd3e.pdfIn PDF document text
    • https://kabulemumolitu.weebly.com/uploads/1/3/4/8/134869515/1013dd49f.pdfIn PDF document text
    • https://site-1180242.mozfiles.com/files/1180242/95679485347.pdfIn PDF document text
    • https://site-1177387.mozfiles.com/files/1177387/venezuelan_gold_farmer_osrs.pdfIn PDF document text
    • https://sewokowoxukipa.weebly.com/uploads/1/3/4/8/134846336/07c19e.pdfIn PDF document text
    • https://pepesavujol.weebly.com/uploads/1/3/1/0/131071240/zozen-vowunajuneli-jujunilusat.pdfIn PDF document text
    • https://sinuvuliwazima.weebly.com/uploads/1/3/1/8/131871572/wekogelerib-wunuginikadi-widozositeribi.pdfIn PDF document text
    • https://rilulukopidu.weebly.com/uploads/1/3/5/3/135323077/mumuvuvofotoxojo.pdfIn PDF document text
    • https://juzefujuninolu.weebly.com/uploads/1/3/1/4/131438825/978b22249519ce.pdfIn PDF document text
    • https://nogorixarolixi.weebly.com/uploads/1/3/0/7/130740589/juretegeso.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/7890191.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lanaladu/84126838850.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/regression_with_censored_data.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A59C 5652 bytes
SHA-256: 72216673b6814d5be6087e56f96a3d542960890c72874a0c535f46191be8c840
font_01_sfnt_off0001b8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8B9 12240 bytes
SHA-256: 4e0cebc85d0df76062bad97d196ea09172cd6c5b578944c5b75bf63387ab066b
font_02_sfnt_off0001e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E153 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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