Malicious PDF — malware analysis report

Static analysis result for SHA-256 32fb6daeb152a52d…

MALICIOUS

PDF

76.0 KB Created: 2021-02-14 05:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b940c010893c5b82d716bba3194423b6 SHA-1: 1d3cb89f67d5cdea3c8e6313788ddaa4199d681a SHA-256: 32fb6daeb152a52d8128935c84c8e7ac4ff4d626fbd5cf2fdc1032e183f64482
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO spam. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'https://jottigo.ru/wix?keyword=aeropostale+interview+questions+and+answers'. ClamAV detected this as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the presence of external links and the phishing/trojan detection suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/wix?keyword=aeropostale+interview+questions+and+answers PDF link annotation
    • https://zefimaral.weebly.com/uploads/1/3/0/7/130776827/sudipebebe_jajome_nusizonif.pdfIn PDF document text
    • https://xadebunurag.weebly.com/uploads/1/3/1/4/131454816/fubedoniveruvup.pdfIn PDF document text
    • https://cdn.sqhk.co/biwizalibe/d1jbro9/stokke_tripp_trapp_newborn_set_recall.pdfIn PDF document text
    • https://xajerunufunofe.weebly.com/uploads/1/3/1/3/131378991/e8e013235ca5b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5fc69194eeb6b.pdfIn PDF document text
    • https://vugawijop.weebly.com/uploads/1/3/4/5/134594760/e4bb5f82.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/jubiferekaka/acer_aspire_5532_disassembly_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/seattle_seahawks_injury_report_week_4.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/29231517388.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/92627633011.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/android_file_transfer_stopped_working.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/clulas_caliciformes_mucosa_intestinal.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/if_platform_ios_react_native.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_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 5220 bytes
SHA-256: 83d7188b13c9545d18b90634bc4d8cb763b0c4990e00085f1cac33d0d9ce149c
font_01_sfnt_off00010032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10032 10088 bytes
SHA-256: 0f68b3fce3a3dc8fa1953477b482d10a14bfe4432713ef331f8a403d782bf99f

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