Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bfc806f6e4f408…

MALICIOUS

PDF

173.6 KB Created: 2021-01-09 01:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fc21c8a730d75a496ff5023a81a9ff86 SHA-1: 6a038f073fb311b1ea5da9ae4fa5cfca5ca737e3 SHA-256: 35bfc806f6e4f4081b06f393acfb6f43560dc5bad8d842238205a977b1a925a0
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier. It contains embedded URLs, one of which, 'https://traffine.ru/aws?utm_term=h+ayuntamiento+de+tijuana+formas+y+formatos', is flagged as a known malicious redirector. The document's structure and embedded links suggest it is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the presence of malicious links is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://traffine.ru/aws?utm_term=h+ayuntamiento+de+tijuana+formas+y+formatos In PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/1425449.pdfIn PDF document text
    • https://tinutenuku.weebly.com/uploads/1/3/4/6/134664278/4989874.pdfIn PDF document text
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/miparapadugolox-bixisi.pdfIn PDF document text
    • https://cdn.sqhk.co/bakavaxa/YjeyYib/gemadomagiwadojafekonobex.pdfIn PDF document text
    • https://luxufaxunixepu.weebly.com/uploads/1/3/4/5/134584211/zebiwa_xifiteto_jeket.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390366/normal_5ff8d8f8ad629.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/Ouhcgjn/9642070899.pdfIn PDF document text
    • https://fimulumalopa.weebly.com/uploads/1/3/5/3/135326017/zofosozavubod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f8b63f3b9712.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b277b3-8581-4f5f-9b8b-da80b1b8f138/8524120062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ce176d-c9c1-478f-88a5-e0eda29c19d0/damerufexodamazebisesin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c72cf62-ca50-41c8-90ac-9c6feee6d4a9/bluetooth_pin_for_wii_u_pro_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b0c1e97-3866-4809-8956-d5827fc5400b/2018_world_junior_ball_hockey_championships.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_off00026800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26800 5160 bytes
SHA-256: a19af2ef384551a5ec1cde55d1a87475131c5e03c158c33c780e24591b5bf65b
font_01_sfnt_off00027985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27985 13940 bytes
SHA-256: e9457d13196e06e978dbb9d721d64e3f6c7b5cf5fc631a237d05701576bfdcb1

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