Malicious PDF — malware analysis report

Static analysis result for SHA-256 434f6fa5420fc97a…

MALICIOUS

PDF

98.8 KB Created: 2021-05-21 08:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7c2a6c7c7b41273f889cb3fdddd73b9f SHA-1: 42ce42db0e0c4951ea7bbbd43e05acbf4dcff6d4 SHA-256: 434f6fa5420fc97a69c95945307b17c6b281c8d5ad5f713856b7695b9878ed4c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://botokaw.ru/strik?utm_term=frases+para+quincea%25C3%25B1eras+de+amigas PDF link annotation
    • https://napakako.weebly.com/uploads/1/3/0/9/130968915/1199340.pdfIn PDF document text
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/pubetidozukutatekuw.pdfIn PDF document text
    • https://mavabebuvaxar.weebly.com/uploads/1/3/0/8/130814237/0597c622b19.pdfIn PDF document text
    • https://molulodanewiv.weebly.com/uploads/1/3/1/6/131606256/4354035.pdfIn PDF document text
    • https://dexajaxalujum.weebly.com/uploads/1/3/1/8/131857565/4400857.pdfIn PDF document text
    • https://punerumoluzes.weebly.com/uploads/1/3/4/8/134897399/zupidi.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/dekezebilan.pdfIn PDF document text
    • https://pemifapizu.weebly.com/uploads/1/3/0/7/130776061/9132394.pdfIn PDF document text
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/1017149.pdfIn PDF document text
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/solenerugitubax.pdfIn PDF document text
    • https://vubisurajoguv.weebly.com/uploads/1/3/4/2/134265568/ritar-rekekiwamivajet-sugefowapun.pdfIn PDF document text
    • https://sodolujakuxef.weebly.com/uploads/1/3/1/3/131398606/zadulupitamigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_605383dabff26.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/4725723.pdfIn PDF document text
    • https://vususutuf.weebly.com/uploads/1/3/4/6/134634118/sazapi.pdfIn PDF document text
    • https://fogufapepupol.weebly.com/uploads/1/3/1/8/131871477/wesulonubija.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403823/normal_5fe267fd8decc.pdfIn PDF document text
    • https://lulodepi.weebly.com/uploads/1/3/0/7/130776712/7028297.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/1135897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387241/normal_606b4f95cf392.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/zidosozawok/54444768738.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/sonic_strawberry_lemonade_nutrition_facts.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/78979801253.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/juwus.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_off00013127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13127 5656 bytes
SHA-256: 418ac0f90b2f5be8c4690dc6c8c61ef6b0b74e752c14740dd49937cfb361e968
font_01_sfnt_off000143f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F8 5364 bytes
SHA-256: 618b4b09c49df9b48680109ee8c14dc21d725d566e030ebeb1ba9a9fecdf0159
font_02_sfnt_off00015732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15732 11040 bytes
SHA-256: 119cb8b48f3b4bca706c980c9e2ded976a14367a198638741e51c7006148147d