Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ae1a4a5a4dc772…

MALICIOUS

PDF

80.2 KB Created: 2021-04-03 06:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ea3d491b8e19eed59f42f42e382cb868 SHA-1: 2f473981772913e9a5daf820f858e5f553352015 SHA-256: d7ae1a4a5a4dc772dbe9aa7f8572d54ab9ee6cf03507847f5f0029254b582ac1
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to salary inquiries, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://crophysi.ru/strik?utm_term=how+much+do+chick+fil+a+team+members+make In PDF document text
    • https://cdn.sqhk.co/zafupusapun/gihijc3/puvorotezipedefoxilewub.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/body_parts_games.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/36724470952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456982/normal_5fd1a9f5a66d6.pdfIn PDF document text
    • http://pobibuja.22web.org/malaria_blood_test_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393785/normal_600766df2b8d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453537/normal_6011e7c6578e3.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/jic8hgh/67682012591.pdfIn PDF document text
    • http://dajexori.mypressonline.com/22672751943.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
    • http://zikoliduxa.atwebpages.com/97269537760.pdfIn PDF document text
    • http://forezepolutaju.onlinewebshop.net/widususevagawuzazawuj.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_9b134918bdc84367aa981f2d5dd90862.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/baabd7cb-0363-41d0-9bde-a4a56c682e83/74353654605.pdfIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_9ca063141a9847cdb8943ab78bcfc131.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ddd249-4c26-4c94-ac06-c78bff570e1d/jubumosegikanize.pdfIn PDF document text
    • http://nulabede.epizy.com/congruent_supplements_theorem_worksheet.pdfIn PDF document text
    • https://7d14b3fe-44ab-47f5-a5a4-fb5d7998febd.filesusr.com/ugd/ba499c_95fd8f117d5c4d8a8d6a000a797c6edd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf22b573-128e-43d2-9a6e-20c8d11674ad/how_to_clean_masterbuilt_electric_smoker_after_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b454f6a-7a06-4649-833f-d10007d23485/wejafaletulavowemisugi.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_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 5296 bytes
SHA-256: e0bba7fd5c6ac1df10b60af491e85e4d0912fb485cda04beca171d165f756f2c
font_01_sfnt_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 10688 bytes
SHA-256: 5c3480d5adb428fd075a0b8aab96db30830242b2490b03ec411be6fab8ccb05f
font_02_sfnt_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378