Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada7e9cae78f0c0c…

MALICIOUS

PDF

78.9 KB Created: 2021-03-31 08:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1a9cf1199aeb6c3861bd8a0fa67c1e8c SHA-1: 5f7b623165649f24aadfd0426e80c0be004aeb66 SHA-256: ada7e9cae78f0c0cbb5988306d940d24e667c39428a4f3966c94af7e8170d407
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to direct users to malicious sites. The embedded document body, though heavily obfuscated, contains keywords related to a book title, reinforcing the lure. No scripts were extracted, but the PDF structure itself is used to host numerous 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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/award?keyword=biztalk+server+2020+cookbook+pdf PDF link annotation
    • https://tuwozuzoleza.weebly.com/uploads/1/3/4/5/134509843/d99690c04ad.pdfIn PDF document text
    • https://jasebezaf.weebly.com/uploads/1/3/4/6/134630561/2b0de.pdfIn PDF document text
    • https://kukurako.weebly.com/uploads/1/3/5/3/135321284/masokewesotuw-bamibodobewas.pdfIn PDF document text
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/34003581a6f59d.pdfIn PDF document text
    • http://turubegu.sportsontheweb.net/82154881429.pdfIn PDF document text
    • http://neriwor.medianewsonline.com/60772713208.pdfIn PDF document text
    • https://dugufenejoropez.weebly.com/uploads/1/3/0/7/130775504/xumotafoxuf.pdfIn PDF document text
    • https://fefokivaz.weebly.com/uploads/1/3/0/7/130776727/83c966ae1cb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412396/normal_5fca121c9950a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385859/normal_5ff8d4bd72f0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_600b62c66637f.pdfIn PDF document text
    • http://dakolozen.22web.org/dslr_blur_camera_pic.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://selifesupenikiv.epizy.com/chutti_tv_tamil_programs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ce7dfc-bd48-44a2-aa9b-8061a4cabb8a/what_is_the_domain_of_an_inverse_function.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/076a231a-98d5-4d94-9b7d-0b78b4a5cc0d/sazatasokasibafiru.pdfIn PDF document text
    • http://mudivufovibu.epizy.com/66228744056.pdfIn PDF document text
    • http://purezaviwof.myartsonline.com/55126615626.pdfIn PDF document text
    • http://xiwozoget.atwebpages.com/coldplay_scientist_piano_sheet_music.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_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 5468 bytes
SHA-256: ba9d336f98eb0f0334fc43ea34a92347a296f04fe0595374e74f37cbc73bc7b8
font_01_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 11304 bytes
SHA-256: c3065eb2ba50233e06a58421c4ee8ba704b1326d8cbbfa50bd2f0e31f42c77e0
font_02_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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