Malicious PDF — malware analysis report

Static analysis result for SHA-256 c658ef780e7c72ed…

MALICIOUS

PDF

81.4 KB Created: 2021-05-08 05:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0484cd4c31c4b18086549c857c77be49 SHA-1: 9ca42c0b423036a8739db3fed29f942b8c967a6b SHA-256: c658ef780e7c72ed8a3f4528bf66717efaa779cfd231ccf3a9916a02065cde25
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://xajibur.ru/strik?utm_term=the+secret+language+of+birthdays+hardback PDF link annotation
    • https://badobokitevobux.weebly.com/uploads/1/3/0/9/130969603/gemudumevafuxegelana.pdfIn PDF document text
    • http://kemovarudowitox.iblogger.org/molexululojavujixet.pdfIn PDF document text
    • http://lenaragiguvajir.22web.org/news_report_article.pdfIn PDF document text
    • https://divowotekek.weebly.com/uploads/1/3/4/7/134759223/e928856b.pdfIn PDF document text
    • https://ralixuviromod.weebly.com/uploads/1/3/5/3/135345966/4918f6a8bdd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_ef778b4c83c74d5380f8011f0dfb3069.pdf?index=trueIn PDF document text
    • https://a6047d18-b57f-4fdc-88fa-dea7715a8642.filesusr.com/ugd/189347_d9136833baf3452e92890608e57c6f9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purufiz/86672061779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd9d43b7-0925-410d-b0ef-ac83625de1e4/60800738622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d2f6b1-e914-4b37-a07f-fdb1a32a6838/odd_thomas_movie_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b08c520-485b-40a3-864f-e502aa32bf57/tusanadivo.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/ielts_reading_answer_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/chevy_camaro_2016_manual.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_c6c5cf67df7c4ede8a84e184bde72953.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57e103a-82d0-42f1-91e3-2977400e2488/dyson_dc26_multi_floor_parts.pdfIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_6baeb84e3a854d72b3c8da64b6539eff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcfda8d5-4659-4a05-bec1-8aef5e748cc7/79567365493.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_70680416de874d6093ec3eb6c0ece685.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_b6d913213a52438089cf1048c927b7eb.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_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 5540 bytes
SHA-256: 0819d4764057705b631b926a90c3cc586fa1a7c5454f9a5d097e497e25f2125b
font_01_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 10368 bytes
SHA-256: 1324b88fb3a58299261e2b633460ca6dc4526b4b4c3283385d00bdfe0ad551bc

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