Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffd9ce7aace4da5…

MALICIOUS

PDF

79.4 KB Created: 2021-03-28 23:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3d66facca6a724cdf56f923edcadd1aa SHA-1: c150e626a1ef491c3bc1f33f7bb231fac25146a6 SHA-256: cffd9ce7aace4da540e174d85aa832723df0c4f573786c1aa3f26fd5f7edc232
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://kuzutuzo.ru/wix?keyword=audi+user+manual+a3 PDF link annotation
    • http://buloshnaya.site/cat_in_the_hat_simple_costumej6h3u.pdfIn PDF document text
    • http://lg-supportteam.com/232911095443033y.pdfIn PDF document text
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/7999109.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372104/normal_60017ddb5ec4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390069/normal_5fca04966a1dc.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/benudivolugi.pdfIn PDF document text
    • http://zifixoribe.scienceontheweb.net/tijobewekolaw.pdfIn PDF document text
    • http://helpverifybadges.com/oxford_discover_5_worksheetsmyq14.pdfIn PDF document text
    • http://busivel.xyz/how_to_find_height_of_isosceles_triangle_without_areaksryg.pdfIn PDF document text
    • https://muwidewosavuli.weebly.com/uploads/1/3/4/4/134435377/497690.pdfIn PDF document text
    • http://poopo.ru/synonyms_exercises_for_grade_4jd00m.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/5369248.pdfIn PDF document text
    • http://instapriz.site/8358308611062n1d.pdfIn PDF document text
    • https://baxorejo.weebly.com/uploads/1/3/5/2/135295822/wabox.pdfIn PDF document text
    • https://bolojowugupi.weebly.com/uploads/1/3/4/8/134886087/1007124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384828/normal_601feeaedb776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491168/normal_601f3c68388e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410013/normal_5fdd946711210.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gewisetug/business_plan_executive_summary_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/tcs_hr_interview_questions_and_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 4816 bytes
SHA-256: 851213bd6d2367b971e8fedfab4bbc6475df1ad79df8e57924d7692cdd078973
font_01_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 11208 bytes
SHA-256: 8b5bea893cc36b16fc06b668469802fba7160c94b554bd1abf0445240a59494d
font_02_sfnt_off0001226d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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