Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced3f27f1404abf3…

MALICIOUS

PDF

79.1 KB Created: 2021-04-24 02:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b70d94fb5e636ae075b1b7823033bea6 SHA-1: 5ac19da343e9ef1b081d2e2dbb1c75044832dfb3 SHA-256: ced3f27f1404abf3bfd8e5bbe246c027b8894526dcac7ace02e6f81b05eea6d8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive URL farm point towards an attempt to exploit user curiosity for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://golowaki.ru/strik?utm_term=ibn+arabi+books+pdf+free PDF link annotation
    • https://folixesu.weebly.com/uploads/1/3/1/4/131453530/59651d406b01c.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/66160020771.pdfIn PDF document text
    • https://vavujajakakef.weebly.com/uploads/1/3/0/7/130740385/kaxewi.pdfIn PDF document text
    • https://jaligudupu.weebly.com/uploads/1/3/5/3/135391073/ninubivozuraxuw.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/hiJih6x/5797658020.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/hhoBidi/tank_stars_pc_oyna.pdfIn PDF document text
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/6281931.pdfIn PDF document text
    • http://fadewujetenuve.mywebcommunity.org/animal_word_search_hard.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/ijIxOif/the_factory_at_franklin_events.pdfIn PDF document text
    • https://leluwimatuw.weebly.com/uploads/1/3/0/9/130969986/lajinexape.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/91937813302.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/ericvTl/88275737859.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/hggdjcx/mesivudi.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/magnetic_curtain_rod_for_aluminum_door.pdfIn PDF document text
    • https://cdn.sqhk.co/venifirub/iyNRJAu/fewasamomigexogojuv.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/ejjHMvU/assassin_s_creed_identity_offline_apk.pdfIn PDF document text
    • https://vifutezovabul.weebly.com/uploads/1/3/1/4/131408528/acc77beb6414.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuneduzib/Egjifji/online_code_editor_jsfiddle.pdfIn PDF document text
    • https://wudowured.weebly.com/uploads/1/3/0/8/130873715/pijazulizelewaj.pdfIn PDF document text
    • http://dusamoka.mywebcommunity.org/2323710928.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_031076f1fc0149b8b2591534ed1e5cb8.pdf?index=trueIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_04e44b1732864c99befa367ea4c1c2a3.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_off0000f217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 5144 bytes
SHA-256: d53fa54a28fed7bab9076cf7f01198018d1a3f0087a14e70a0c5674632ef28b6
font_01_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 14452 bytes
SHA-256: 2c1d65fc771a2a417c023f10f26929d3787a632ba5e31f416582b7fb54d294e6