Malicious PDF — malware analysis report

Static analysis result for SHA-256 723d09d4ddcacdf2…

MALICIOUS

PDF

76.0 KB Created: 2021-04-26 09:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1d74ab1745a3087b97fcf35626738ad8 SHA-1: 084b81017b481d3aafbce6da77b61acf0e87da95 SHA-256: 723d09d4ddcacdf2e5d3628a8520df30e3349a1579246d4d951d7b11b5219983
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to contain keywords related to device programming, suggesting a lure to a malicious site. The presence of external URIs and link farm heuristics further supports a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=motorola+xpr+6350+programming PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456399/normal_6045075c75b63.pdfIn PDF document text
    • https://topuzuxet.weebly.com/uploads/1/3/0/7/130739133/ludizavewoxapem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480161/normal_60246f0364e10.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/af89436d7526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_604d29e7664eb.pdfIn PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/b692fd14da066e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_603feddccfc59.pdfIn PDF document text
    • https://tewawabuse.weebly.com/uploads/1/3/1/4/131437503/paxekumipefuvatizuxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_87553cb872f7444481dfbe56fea2217c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/litunux/56268382024.pdfIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_89038acd1d53422ebfb814d832b31895.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/21669975050.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/17820559076.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_28608d2c54a846dab547236b434d0892.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/facebook_for_mac_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/85628548408.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_10967fa31a504f2998668d46347371bb.pdf?index=trueIn 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_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 5616 bytes
SHA-256: 76943e4dc0d1bdc2f693cdef28511b9121117a66f090bb4592c6e2137370d0bb
font_01_sfnt_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 11412 bytes
SHA-256: c9990906e874256b048fc9e700ac4879687db6ff675f553cf719b6a56a2d90b0

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