Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59b30a62e5be1a9…

MALICIOUS

PDF

74.4 KB Created: 2021-04-02 03:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dc7e4c9e9de3753045e71d6efb6249bd SHA-1: 2f1b81a4ba53b9b740800ddddb7ddce1c89e24ff SHA-256: a59b30a62e5be1a95cca94f371d9d2a595c5471787c4bdf4e389ffea2a7c501d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and a machine learning classifier, and contains numerous embedded URLs. Several heuristics indicate it functions as a link farm, with some links pointing to known malicious redirectors or disposable hosting. The primary purpose appears to be directing users to potentially harmful external content, likely for phishing or malware delivery.

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/wix?keyword=snapchat+story+viewer In PDF document text
    • https://rulakufip.weebly.com/uploads/1/3/4/4/134489053/5ac1df.pdfIn PDF document text
    • https://soxotinimom.weebly.com/uploads/1/3/4/8/134883838/vasugemupomokiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_6048234ca4273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_6050c70fb2f81.pdfIn PDF document text
    • http://jisotevujemi.22web.org/gina_guidelines_for_pediatric_asthma_2020.pdfIn PDF document text
    • https://penaveligatoka.weebly.com/uploads/1/3/4/3/134314422/bororuvi.pdfIn PDF document text
    • http://kugaraginoja.mypressonline.com/moldes_de_letras_grandes_y_bonitas_para_imprimir.pdfIn PDF document text
    • http://rezokivi.medianewsonline.com/manitol_vs_solucion_hipertonica.pdfIn PDF document text
    • https://cdn.sqhk.co/leguzufaju/lNZjjii/slots_machine_games_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450870/normal_6019d6cd0d9c2.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/2eCiejf/antares_autotune_5_crack_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446634/normal_5feebaf3ca7f6.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/6fFhfhh/26924317411.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473322/normal_5ff24d0d32b65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_34cc90caf6b7459994707f310e30251e.pdf?index=trueIn PDF document text
    • http://zuwajuzi.epizy.com/57335201015.pdfIn PDF document text
    • http://pajupevezujugut.atwebpages.com/fluid_mechanics_differential_equations.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_03ac277348bd4401b93d3b87c20ca034.pdf?index=trueIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_42332ab751c443088d3f810a1050bee9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 5344 bytes
SHA-256: 8940b113bb1117d4c1dd0832e19f71881896b6ec62c8ca59054b57f9adbd515c
font_01_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 11072 bytes
SHA-256: 5ea959a53aae48b211bd0dd6d9083617b11685b9baa15e3c109421f9d94556c5