Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e48a1ea4bb2ec6…

MALICIOUS

PDF

94.6 KB Created: 2021-03-05 08:40:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8a9ad39a8f3bea6e194f362400f367eb SHA-1: d192b4b33f109459f2e70678e1be82a9d130d03c SHA-256: 50e48a1ea4bb2ec647a2fedf7b7c047db1ed2964f59e22de4682eef97fbb2dbe
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting and redirectors, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=7+step+hurdle+technique In PDF document text
    • https://karawabinu.weebly.com/uploads/1/3/1/4/131453718/jivafamubob-pevirolalepo.pdfIn PDF document text
    • https://jasudelile.weebly.com/uploads/1/3/4/0/134012727/b7616536a8.pdfIn PDF document text
    • https://dapofawebowo.weebly.com/uploads/1/3/5/3/135347186/fekaraxididodonatite.pdfIn PDF document text
    • http://getsalle.xyz/freedom_trail_guide_fo4cs4b4.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/nosaruzipexekad.pdfIn PDF document text
    • https://zedumolubu.weebly.com/uploads/1/3/4/8/134862080/2920519.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/53096433285li074.pdfIn PDF document text
    • http://remeik.ru/apology_email_to_client_templaterwcb3.pdfIn PDF document text
    • http://espaceabonnes.com/lozufifopituqw3xo.pdfIn PDF document text
    • http://covidcapsule.world/796897522343kdde.pdfIn PDF document text
    • https://rafopovuweke.weebly.com/uploads/1/3/2/7/132740485/kaxizilugarofafevun.pdfIn PDF document text
    • https://kigotofu.weebly.com/uploads/1/3/5/3/135323523/1909629.pdfIn PDF document text
    • http://mbfsopg.com/tirolwv7xm.pdfIn PDF document text
    • http://bunnygummy.ru/7238840545758xp8.pdfIn PDF document text
    • http://vsedlyatebya.xyz/the_cheetah_girls_moviega9lp.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://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_c2249ab4c69149b28b68b8348add0fc5.pdf?index=trueIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_39a219acecbb4e5d9eb80ad7d8a163ee.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_0dc3d46270d742f694599b40c2c21c37.pdf?index=trueIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_6536618a6dd249a2896e6b25817bbfe3.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_3596e862d1d44276940d94394d94f9b1.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001214f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 4836 bytes
SHA-256: 0c9b0eb1a04b14de9bee5d44308005dcfbba3f5ffe98447aab504586e7bce8b0
font_01_sfnt_off000131ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AE 14876 bytes
SHA-256: abc14c84940f672e01cfafda34c411f99f3a446c466c9b31c7d2b64b8754e1ad
font_02_sfnt_off00015f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F79 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361