Malicious PDF — malware analysis report

Static analysis result for SHA-256 b280a832ff64db9d…

MALICIOUS

PDF

73.7 KB Created: 2021-04-01 22:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 432214c11dc52fcf13472a1255eb2f4b SHA-1: 904e55687243b6bbf16f0b29ecf3265bb489cee3 SHA-256: b280a832ff64db9d64ee5a9b4cf9bf96dc3605a9415e67bbaa38d98d14fd58be
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=how+long+to+cook+roasted+sweet+potatoes+at+350 PDF link annotation
    • https://gibexiwufanoti.weebly.com/uploads/1/3/6/0/136099712/9111821.pdfIn PDF document text
    • https://murozukuzofapu.weebly.com/uploads/1/3/4/7/134716639/8413095.pdfIn PDF document text
    • http://homebig.space/gun_sounds_fivemmvg6q.pdfIn PDF document text
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/zojusap.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/6055696.pdfIn PDF document text
    • http://betmoy56.com/78228971476f7lwk.pdfIn PDF document text
    • http://astrohelp.space/quarterly_business_review_format1vntl.pdfIn PDF document text
    • https://duweliga.weebly.com/uploads/1/3/4/5/134593675/didojober.pdfIn PDF document text
    • http://nesobaka7.xyz/phases_of_green_revolution_in_indiaezjfy.pdfIn PDF document text
    • http://timelessdecorum.com/objective_soil_science_by_rameshjqkci.pdfIn PDF document text
    • http://copyright-supporthelp.com/36732529185oeivk.pdfIn PDF document text
    • http://tujukesabegakom.mygamesonline.org/4141883175.pdfIn PDF document text
    • https://zukolipiniroti.weebly.com/uploads/1/3/4/4/134494738/1917735.pdfIn PDF document text
    • http://vnds-super.space/xorobc8n5g.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/927a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kojuvurapamox.myartsonline.com/zumatorep.pdfIn PDF document text
    • http://nigagemi.rf.gd/astrologer_s_day_story.pdfIn PDF document text
    • http://wesakuboviku.epizy.com/boost_juice_menu.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_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 5788 bytes
SHA-256: d5b4320ea77af20e444f95129b094d495e148ec0031ee61820b0542989b84cce
font_01_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 10964 bytes
SHA-256: febc670dfce13a249ba4fe7dd83501962543790ab2b9099ca0e218dd907b49e8

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