Malicious PDF — malware analysis report

Static analysis result for SHA-256 83833e995bc1de58…

MALICIOUS

PDF

77.7 KB Created: 2021-05-07 09:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 323f3e64c238b0b8b986ad5add3e6ec9 SHA-1: 926918fa16145390e7d3431d334fbe00dacbada3 SHA-256: 83833e995bc1de58da8e2a68f3e0f370f91ca2e98972d2ccf4a5f47aa5440bc8
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 0.9997

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://vilenefex.ru/strik?utm_term=my+many+colored+days+activities PDF link annotation
    • http://1xbet-registrat.site/hp_officejet_4500_g510h_driver_for_windows_7qavca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_6010f72319338.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468296/normal_5fe42b5b7fcf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486537/normal_601f3d835d99f.pdfIn PDF document text
    • http://varistop.site/421450263143uq1y.pdfIn PDF document text
    • http://begetus11ppz.xyz/7480812410xbq15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_6047d71f30b38.pdfIn PDF document text
    • http://study-english-04.space/youth_football_strength_and_conditioning_program8ksdl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fdbfdcab3683.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/a8b27cb8-19b4-43de-9094-cfca5c36012d/wetevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/162eefbd-8188-4503-bbe7-fd37b597e2ac/excalibur_food_dehydrator_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888109d8-58aa-4869-a3ca-20992f51dd5a/what_color_reflects_the_least_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997d4396-be76-4fa5-975f-cfb6fe932e75/game_of_thrones_cast_season_6_the_waif.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/5940296034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8cc1c44-177f-4807-bd68-3e7d07ca4fff/jokunetofomebabuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/21008196122.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/god_bless_america_sheet_music_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1da2c7-f80b-43ff-bef9-6c1f5a095962/zetovemobatode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa8a5d6f-dac4-44d9-b9ef-87d87de97498/6002203904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29772530-628b-47e5-ab6b-b5c760cfcd39/gusifavegilif.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_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 5252 bytes
SHA-256: 3965e722e8663ed6db5a97c3e529ee5dc00d25034141503e222d4cea4f9e333c
font_01_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 10564 bytes
SHA-256: a283a5ce77ba41bc45bd9c68103922fd7118d02bb7259e2c59be74e808afe5a5

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