Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb8550c23dbd0d5…

MALICIOUS

PDF

67.2 KB Created: 2020-11-10 07:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c17c32308bff19db01e777f28fcc507d SHA-1: 71a42c99bbbf7b298dfaec8abff3a36dbd3cf4ca SHA-256: 6fb8550c23dbd0d52e3e0471ee981ddfba77edabc01607d7abc68ae09f40c600
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, and is also flagged by ClamAV. It contains a link farm designed to redirect users to potentially malicious sites, with one specific URL identified as a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to school calendars, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?keyword=broward+county+public+school+calendar+2020+21 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f88156b9333b.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/visutelagusege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f8d0b1fe2323.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/giwaravudifoxatedesi.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/593cb29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403947/normal_5f9bbdaa1ae19.pdfIn PDF document text
    • https://kafedujewerom.weebly.com/uploads/1/3/4/6/134622586/tifamibameb_rumoja_rujax.pdfIn PDF document text
    • https://lewetidol.weebly.com/uploads/1/3/4/4/134462927/sorajuw.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://uploads.strikinglycdn.com/files/c30397ee-a8ec-4382-81a1-e0e43c1740be/metemebavapekobevo.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/56912044721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b4972c-a778-47c8-b1f3-bcec4b761703/72813167567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ba3c9f6-3eb5-45ed-b7b3-e9e94ff83afb/48754276078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43fc2b09-0adf-458e-a9ff-8b2a2c2d5e00/41172854484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc52ba50-a274-46c6-9687-13e3081e302c/driving_directions_to_marysville_ohio.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_off0000bc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC09 5752 bytes
SHA-256: 530d1200151ea54ae0e2eb8550a1fc4489ddebe589b3001e8989ce722e119031
font_01_sfnt_off0000cfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 10032 bytes
SHA-256: 52f43c10345b071e569266c865327cf3216d9d3a62b7675a3c4dbb0620e893e7
font_02_sfnt_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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