Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb344abfd853ac63…

MALICIOUS

PDF

79.8 KB Created: 2021-05-30 00:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 052b206582cbd9e8848bc760cab8b39e SHA-1: 3efda07cc5f99ebf61ba9ebf88867c9c9a93bff4 SHA-256: fb344abfd853ac6368f2b1d15d56f04e262f9ad508fa7bc188613f89b29709b7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The embedded URLs suggest a potential distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://jacksth.ru/123?utm_term=direct+speech+free+worksheets+grade+4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369916/normal_600494c8104b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478133/normal_601b8acb2775c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451954/normal_6005c0d4ba3bd.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4390324/normal_60b2abf328d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481422/normal_604e49bbb2308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_603c2feb3c23e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4446647/normal_60b1d8cf8f50b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443810/normal_5fd3b84ea6f2c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4455207/normal_60afe47f7f818.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368245/normal_5fee0df314243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_600f52978e70c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_6041485d73d2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_6041df9512140.pdfIn PDF document text
    • https://jabikazisejifo.weebly.com/uploads/1/3/1/6/131606509/satepuvosan_mobizabubafaxo.pdfIn PDF document text
    • https://kodidenub.weebly.com/uploads/1/3/4/3/134328035/lebozo.pdfIn PDF document text
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/fuzifeliwuz.pdfIn PDF document text
    • https://kilekefaze.weebly.com/uploads/1/3/4/6/134631798/kulilavaguralumurum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383128/normal_5ff8dd996938c.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://uploads.strikinglycdn.com/files/4d149784-8de4-4bf3-99a7-ddf2c671a9a6/19788333168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1873340-998b-40aa-aa93-bbb1a3495c05/43544457246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0ce3fee-ef11-4a19-9eee-4cc311733e8a/onyx_245_error_7_fix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50592596-8f89-4006-b728-b56547167f93/zebutaguzukufir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a78aac-ebe5-489d-834a-9f096f292231/zewivogugemuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1218f119-ee87-4eaf-a581-741c8bdb0a34/operaciones_polinomios_ejercicios_resueltos.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_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 5308 bytes
SHA-256: 45b3261c15187ef26641f42fbff0f6c80de76d008698cfceb907ab963bf227c2
font_01_sfnt_off0000fe21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE21 10972 bytes
SHA-256: 913ba3aad8fceb7360897d76299fa5e4743d24b6b43ebeb6aa0fbda860e156e5
font_02_sfnt_off00012367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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