Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a423bb40930aca…

MALICIOUS

PDF

75.4 KB Created: 2021-06-08 09:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fe4d9bd5a91840ce5f159c2fd37dd431 SHA-1: 29c3225772fd56723c554e3c79dad81d4bd507b6 SHA-256: c3a423bb40930aca98e944cd95ebc0776a45b7d6a7450cd5c8fed5012a164adc
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/pbw?utm_term=butterfly+acrostic+poem+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366043/normal_600f87b0b9467.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413851/normal_5fc8792229ad8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472206/normal_602cf5150ef3d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4486215/normal_60b3c7084b097.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5fd0650b2c572.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365591/normal_6004f0dc7d3d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493890/normal_5fe9a437c79a7.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/3a10d6f3-29db-417e-bdef-60df57941b74/nezolizegekosibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed9e8871-aa0d-489e-a889-1aad07b3e803/6599685985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60df4dc9-4743-4af5-b44f-dc2d43d5e9b0/libro_para_colorear_netter.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/f/giletufudafat.pdfIn PDF document text
    • http://dejimebez.pbworks.com/f/6___4.pdfIn PDF document text
    • http://pigikeziba.pbworks.com/w/file/fetch/144832686/84121943093.pdfIn PDF document text
    • http://kugiwetod.pbworks.com/w/file/fetch/144809721/how_to_determine_true_market_value_of_a_car.pdfIn PDF document text
    • http://bibosopimugo.pbworks.com/w/file/fetch/144630126/worubogeti.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/what_included_in_an_autopsy_report.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144527823/19569915049.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_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 5380 bytes
SHA-256: 518a5963ec2e5fa69a3e694bd74ba02c6928582e2e1893d16757ed87bf176a62
font_01_sfnt_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 13804 bytes
SHA-256: 299c9ef566f62d749d04146a250e0bb2e14e8642dc21206ece01414644cec3d3

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