Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43302fafb8f8fde…

MALICIOUS

PDF

78.5 KB Created: 2021-02-20 04:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b988c63b566d5b11777cbb0241f083cb SHA-1: 774986cb3d199f510cb90f7c716fd26c1c7b0561 SHA-256: e43302fafb8f8fde76d30a76612189c192439e6efd19e73f88864b93f6f2cda3
184 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 finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://yafferge.ru/123?utm_term=calories+in+a+breakfast+baconator', are designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains fragments related to search terms, suggesting a phishing or scam lure.

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://yafferge.ru/123?utm_term=calories+in+a+breakfast+baconator In PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/c2daa1572213d40.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/22d8b5328982.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/YibhhKT/lodaxukekapot.pdfIn PDF document text
    • http://fenofaxizuva.22web.org/template_daftar_riwayat_hidup.pdfIn PDF document text
    • http://vekifurusib.22web.org/6th_grade_math_vocabulary_worksheets.pdfIn PDF document text
    • https://xovotirepotu.weebly.com/uploads/1/3/1/4/131412955/bebifeg-pefaxu-motakoboridepu.pdfIn PDF document text
    • http://richmaya.site/fourier_law_of_heat_transferno079.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuzini/gfG6ge6/kodiak_cakes_shark_tank_investor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387715/normal_5feb34c50622f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_5fdb66ec84055.pdfIn PDF document text
    • https://lusebedadejaxid.weebly.com/uploads/1/3/1/4/131407110/poforokezuxivuzox.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/idkkHie/rujuwuwadijewumag.pdfIn PDF document text
    • https://dopupuwupexiro.weebly.com/uploads/1/3/0/8/130813117/7734460.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480753/normal_5fcb086eebd85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bojafazes/fusavijivigonuxidefo.pdfIn PDF document text
    • http://mitazitovir.epizy.com/mijijadixe.pdfIn PDF document text
    • http://wosoremozojofam.epizy.com/34271295088.pdfIn PDF document text
    • http://kosidigipetuvu.epizy.com/54107642032.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_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 4984 bytes
SHA-256: a6059463c27ba5117ae03052a87b0ee7761086263f802f296449e73a0c034344
font_01_sfnt_off000106bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 11180 bytes
SHA-256: f5eef33e495ee4fcf758dbeccc6b9b66d47f067247c202f6d03cb61ab1858701

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