Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d29a1c768a1626…

MALICIOUS

PDF

71.7 KB Created: 2021-03-09 12:33:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 60a04093f4c51f73d40901ad3daed883 SHA-1: 1dbb713b81de69ce87f1872ed991b6dd40e53cf9 SHA-256: 37d29a1c768a16266f43188525d526313cf11b03d7ea4bf4cafaf33e27ae193f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URIs, including a link farm on disposable hosting, suggesting an effort to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=stony+point+baseball+schedule PDF link annotation
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/jawejo-zojifutomure-kejuboxofuvo-bapefotuzaf.pdfIn PDF document text
    • https://lowizozexide.weebly.com/uploads/1/3/0/7/130776176/4338594.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/SOmQYgm/naribonupozisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_5fe92b5ea4a62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456671/normal_5fd3972a25de6.pdfIn PDF document text
    • http://fumaposowev.22web.org/zagojoridekezepediwinune.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/agjTij0/snipe_animal_hunting.pdfIn PDF document text
    • http://jefogidit.iblogger.org/nosejejiwefom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413126/normal_5fecd1869fb18.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/hfXgdjj/jixemas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392647/normal_60093dc516cd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381531/normal_5ffaeec1f0bf6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mobisojew.epizy.com/jovozade.pdfIn PDF document text
    • http://putiremupupunis.epizy.com/fadejipo.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_d99c7bdaaf7f4a10a688c8fd58bec05b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jovekus/cg_ded_model_answer_2018.pdfIn PDF document text
    • http://nasakitubaribud.rf.gd/xuvenazujotunavaf.pdfIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_a2ce2dcabfab49d3ac8c6460daffad71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/costco_pizza_nutrition_information.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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 5408 bytes
SHA-256: 544c3bcccf2284ae53c69045a195379b0a4b4165361f5f9812ebb10ab63e11a9
font_01_sfnt_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 13168 bytes
SHA-256: c5812b7502ef47ffde74cb8283f61506b938ddb3bada4affa113e8f47ee3dc86

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