Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03de38edcc1b759…

MALICIOUS

PDF

77.0 KB Created: 2021-03-18 13:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f50216d139ab84550a313d451ac43f1b SHA-1: 51d7c980390241cfd482d4f5f3811f14eefd0cae SHA-256: a03de38edcc1b759dff336985690c76bae7c2165f90c9c80f0a9d00041bce929
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=brinkmann+water+smoker+turkey PDF link annotation
    • https://bizotimugir.weebly.com/uploads/1/3/1/1/131164076/rusax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481270/normal_5fd3bd364e90a.pdfIn PDF document text
    • http://rowaxuxot.22web.org/cd_araketu_ao_vivo_1998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421476/normal_601ae1b721285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_60334578b1987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472481/normal_60148a572c665.pdfIn PDF document text
    • https://semukozev.weebly.com/uploads/1/3/4/4/134493414/a3cbf2.pdfIn PDF document text
    • https://rurajisikite.weebly.com/uploads/1/3/0/8/130813509/3144255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5ff1537c70693.pdfIn PDF document text
    • https://gizunujidibe.weebly.com/uploads/1/3/0/8/130814387/5137d08.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/5c53c119-fbfc-46d6-ba24-14520149756a/10490940068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/476b74ee-37b2-425d-9f6a-912cfda1d376/what_are_some_popular_german_names.pdfIn PDF document text
    • http://pofumitiko.epizy.com/georgia_travel_guide_coupons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6943768-99d7-4cc1-920b-33f5a560f2a8/75349416509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b053f6d1-4a3e-4035-affa-faf243bd4070/what_is_violent_media_in_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0e0eff-9f84-49e6-8720-d6fe1edc912f/angles_in_parallel_lines_worksheet_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09da7a45-1597-4fe7-83a9-daa6e3c75cd1/tivesavutura.pdfIn PDF document text
    • http://dekutob.epizy.com/que_es_el_languidecen.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_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 5104 bytes
SHA-256: c4399921de8029829c6193d1cf462869692769eb63217420467ea5239d458df6
font_01_sfnt_off0001028c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 10736 bytes
SHA-256: 631ba1f28e74be96e778bbefeec1708306c658461c512a65c1a16fc412ddda9c

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