Malicious PDF — malware analysis report

Static analysis result for SHA-256 1502869ec6049c65…

MALICIOUS

PDF

72.3 KB Created: 2021-02-15 17:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 55772a9fd7bd5bbfd1952e8a7c9128f6 SHA-1: ab457f0966cde6a035748a15f89d5055dba986ef SHA-256: 1502869ec6049c65cef9db8d7c90bf7d65f7997702018846faa6881650676998
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, with 28 distinct links pointing to 10 different hosts, indicating a link farm. One critical heuristic flags a link to a known malicious redirector, and another identifies a link farm on disposable hosting. The document body contains garbled text and a reference to 'Is megan is missing on netflix', likely a lure to attract clicks to the embedded malicious URLs.

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://yafferge.ru/wb?keyword=is%20megan%20is%20missing%20on%20netflix In PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_601e8ca6d3099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_60254594c34af.pdfIn PDF document text
    • http://pobalulegofi.22web.org/32691093812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417212/normal_5fdb555a4b253.pdfIn PDF document text
    • http://runolive.com/99619445791bj83l.pdfIn PDF document text
    • https://timakopazasiri.weebly.com/uploads/1/3/4/4/134445807/sefopedizozux-lefisedakabige.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380413/normal_5fdd27ebdf03c.pdfIn PDF document text
    • https://xapenivivafozeb.weebly.com/uploads/1/3/1/3/131379266/sipavovalir-lufoje-pivabibega.pdfIn PDF document text
    • https://pipewasages.weebly.com/uploads/1/3/4/0/134017488/kupuxolobomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421354/normal_601f7dff2e168.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_6009a300e9ff4.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/jupujox-poxumiworuserog-sezofav-vofelirikudime.pdfIn PDF document text
    • https://mopuvavipobum.weebly.com/uploads/1/3/1/0/131070525/fezirafikufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dumevurofif.rf.gd/netflix_android_app_link.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 4996 bytes
SHA-256: 99f6560a66f10029974bf5588c161f138618604f2b97b808fbe3aaab016dcd80
font_01_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 10852 bytes
SHA-256: b30c067dc41a6ce00d21504bdd040c275cee4238a95eca9c1d99ad5883f82014

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