Malicious PDF — malware analysis report

Static analysis result for SHA-256 31576249f4c8b5b0…

MALICIOUS

PDF

73.9 KB Created: 2020-11-29 20:07:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6dc08ffe994a03e7620bcbb172c34b2d SHA-1: ba068014ae21c4f313c5547231ede3894134eaa3 SHA-256: 31576249f4c8b5b0e3b3346cbb41ed507ff49acd304c4918786636195f6d5d71
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to disposable hosting sites. The ML classifier and ClamAV also identified it as malicious. The primary purpose appears to be directing users to potentially malicious external sites, indicated by the presence of UTM parameters in one of the URLs. No scripts were extracted, but the structure suggests a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafficel.ru/strik?utm_term=bakery+story+appliance+unlock+levels PDF link annotation
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/4521781.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/3c840056.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/detusesusixer.pdfIn PDF document text
    • https://zoforute.weebly.com/uploads/1/3/4/3/134352948/6650383.pdfIn PDF document text
    • https://beritugemob.weebly.com/uploads/1/3/4/3/134332724/9461096.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/7bf0538fede6e3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/dc32b636-3b4f-4d11-9391-f34b894b2e02/wowifijawezesorejesodet.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/detala.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/app_activity_android_appium.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/zivosojenarasowezadisaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7dc9344-fb69-48ac-99c6-2dad8ec4dffa/manual_de_karcher.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C2 3424 bytes
SHA-256: f1e366e2dfb248293368ca5178f5b85207bced6b383c25f49e783ff482827550
font_01_sfnt_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 5084 bytes
SHA-256: 33699afdc0d7fb5d7f8f85e013304cf1bcb1f1065629569feaf0df5c39a01033
font_02_sfnt_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 10632 bytes
SHA-256: fb50e55aac55605b189ff0701b34c47aaacdd9e2bece19be11fa1f7d627de2ba
font_03_sfnt_off00010acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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