Malicious PDF — malware analysis report

Static analysis result for SHA-256 70abe12ca554585a…

MALICIOUS

PDF

71.9 KB Created: 2020-12-21 20:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 55911e46bb97877e732e5816bcb4ed39 SHA-1: e0ba885c9c0f34ec823aa0eee4c14e8c188feb35 SHA-256: 70abe12ca554585a8336d6c9cc32fd133dc8c89184186e67eac492386be14822
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable hosting services and one specifically identified as a malicious redirector. The ClamAV detection and ML classifier further indicate malicious intent. The document body is heavily obfuscated and does not provide clear instructions, but the heuristic firings strongly suggest a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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.
  • 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://traffmen.ru/aws?utm_term=resistance+and+resistivity+worksheet In PDF document text
    • https://jadigitunuw.weebly.com/uploads/1/3/4/6/134672933/9767500.pdfIn PDF document text
    • https://pemopexo.weebly.com/uploads/1/3/4/3/134305592/765e8bd0c.pdfIn PDF document text
    • https://zomujowedava.weebly.com/uploads/1/3/4/6/134629266/buwatapodev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f98a20524e32.pdfIn PDF document text
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/lapaloxadigazi.pdfIn PDF document text
    • https://jadozuvar.weebly.com/uploads/1/3/5/3/135312187/buzovezonove.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/5fc169f3e2fce462bc8f8ca6/t/5fcbe04b1ef6d1662ffbbf81/1607196748278/dungeon_maker_dnd_5e.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/51990784618.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc39d206b97992eb56cd759/t/5fc8bda18eecd53e39f1d05d/1606991265588/32208260016.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/bewabi.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEF 5224 bytes
SHA-256: 9f6ec24e0538e1badc2fb83768abc00ca457d74b0014e1b558da6012b321e75a
font_01_sfnt_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 5320 bytes
SHA-256: 97741b0293fe6db32edd8cd7d5e2f3b69419f1d1eef367a2ad6297e7e9c663ea
font_02_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 10036 bytes
SHA-256: 117bafce1f08d30520c126a17896bb181e4e34bd680ab331d57f8c5f6d823fb5

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