Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fba0a97c8202c45…

MALICIOUS

PDF

76.3 KB Created: 2021-03-08 22:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d06bda0664e8f6c7b753aa24b3a4bab9 SHA-1: 3210585ff7e542612ac8cba004b36a1caea3ed6a SHA-256: 8fba0a97c8202c45bc9ad8111e579dc26e7f9a80d53cd4390ca3ed7f1ab71b5c
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 0.9988

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://jumiwimov.ru/award?keyword=collection+letter+pdf PDF link annotation
    • https://cdn.sqhk.co/lojosewude/2WCC0S6/zumilejikavepatamazure.pdfIn PDF document text
    • https://fobanuvoba.weebly.com/uploads/1/3/1/6/131637247/2485495.pdfIn PDF document text
    • https://zewerigavuj.weebly.com/uploads/1/3/2/6/132681779/nunuj.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/j7MFbRg/how_to_get_a_girlfriend_as_a_girl.pdfIn PDF document text
    • https://lilususuki.weebly.com/uploads/1/3/4/3/134317990/wetozuseto.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/sAGifFi/54418634178.pdfIn PDF document text
    • https://cdn.sqhk.co/wefonasifaza/fr3oi4Y/87002738375.pdfIn PDF document text
    • https://cdn.sqhk.co/bularalunop/ddKiiT8/3_movie_theme_music_remix_ringtone_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/xTuhbha/mobile_car_mechanic_near_me_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/jAtQrhb/20752048395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_8c2213255fd7482184f302e0d75b29e6.pdf?index=trueIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_c22f51b714f44ebc91ca3e8c540c74e3.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_48f91466048648c6acd10dcb246a2287.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac8f0fd2-f0be-4ce7-a79b-88f7d52cf3a3/wikofinujezasopiviziro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68b9cea3-be66-4bc1-bad7-919da196adc8/lesson_12-1_flow_chart_proofs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/527b497d-b87d-4123-9c7e-c170ddb3fcb3/morobuborolubefa.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_e30c3f1db5514a8986b910a14b373607.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_76a7c501de9447719d18ff60773cd294.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7cb0132-9143-4dbf-81c9-2fa731488574/propresenter_remote_2.1.6_apk_obb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3b97e7-b03e-419b-89d9-2dbcd4890c98/pablo_neruda_poemas_de_amor_portugues.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 4664 bytes
SHA-256: 22c287dd234ffd6179e156fcd09ffc1cf3546a4108e3e9b35ebb6e1744567da3
font_01_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 10308 bytes
SHA-256: 57d719a987bf1ddf14a0bee7231672339a3898cfded577d1e08d56a8757f53f9

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