Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad15ffbe29019f39…

MALICIOUS

PDF

81.3 KB Created: 2021-04-16 06:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e379dc64be296b75c7bf25351dbdd5b9 SHA-1: 2ab1778c97e7690c64d99c349294b1dcfa0b2955 SHA-256: ad15ffbe29019f39398562750be4a4d0aaf628210067ada55142ba3dd918eab0
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://fokemale.ru/strik?utm_term=tax+deductions+for+working+from+home+2019 PDF link annotation
    • http://filmera.ru/jobixivgdbwm.pdfIn PDF document text
    • http://boomerangoo.site/bedarakevumemelexepkcvng.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461249/normal_6050ce0436db8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490269/normal_6060ab501c9b1.pdfIn PDF document text
    • http://disewoterud.22web.org/psychological_testing_and_assessment_textbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454691/normal_60499e42b8a97.pdfIn PDF document text
    • http://nubolats.xyz/13043796593wuaxq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423166/normal_6007afd350d0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420930/normal_5ffa22cdbeb2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sivetidezu.epizy.com/74210109688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4809f21f-1cec-42ba-92c3-9b84197a6bb7/73782434832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53bc7854-7d8b-4b96-aac1-ca8b97caad0c/73601716720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68281cbe-e839-4dd1-856c-abaf264a59cf/2021_lds_youth_theme_gifts.pdfIn PDF document text
    • http://rugogevegemup.rf.gd/possessive_adjectives_object_pronouns_exercises.pdfIn PDF document text
    • http://zoxokukazo.epizy.com/3726030681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8abc96e7-1c1a-4e20-85fa-6ee9bcc3b37a/42827891237.pdfIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_1471fc7e95604d48bad52dd4e71f5d40.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_cea07ac9df284abc93e8b810d649d386.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 6060 bytes
SHA-256: 8d2838d04278950cd81ad137fdcac3dde850e03cec23be78ace43c1eb559e45d
font_01_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 11060 bytes
SHA-256: ab800a3f397fdc7cac528e81b227e503716aaad803a456c1563f0c2bfc0d09a5

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