Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ff1109218346f8…

MALICIOUS

PDF

75.7 KB Created: 2020-12-16 08:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 47b19c55986632c439d689999903d466 SHA-1: ef75f86d91b6107fe9daf1940691c40e359d1100 SHA-256: a2ff1109218346f8c408ac6503ed2ee2507134f49e7e1e6d9705de5a827f61b6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through link farms. No scripts were extracted, but the presence of numerous external links suggests a content-driven attack.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/123?utm_term=photosynthesis+reading+comprehension+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4453734/normal_5fc1cb7b3b251.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/dfa5b267ffbfbca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc66c646b97992eb5814648/t/5fcf80c45c8977691e3eaa85/1607434437205/zurabot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c77adb-f1db-45c1-9edb-e0384269ffef/girolokuwovopome.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f22ee5c7695ca99bddc9/t/5fcd9502e43f2b00a8c2e741/1607308547586/97629005937.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/dave_alexander_md_nashville.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28f693dfdd95b60dfa9a7/t/5fd177f4880fa23343ca15da/1607563253049/95682172628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03b54c9c-bf6e-40b5-9f26-e6e1c4c0988a/lulikusesikefezetiz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d49a16f6d44b07be6b5d/t/5fc1c0d13485235c8607f718/1606533330682/oracle_architecture_components.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/balance_sheet_reconciliation_statement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e5d160-6878-4d51-a1dc-6596e84ffaa1/40591227242.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_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 5668 bytes
SHA-256: 6fe2b54094f4a15d16ee1497bb392937f2f02d6190ca1d1703df10da13dfffd4
font_01_sfnt_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 5640 bytes
SHA-256: 35f2ec44746e5faaf45efc94ab1f80c61db510a89ab825b288c81f25ddb27825
font_02_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 10960 bytes
SHA-256: 12f6ee0b21d9149134fb7e4e0279486d546280d23eafbcfd9c86b6c3996f795d

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