Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5578b76ea77b24a…

MALICIOUS

PDF

77.9 KB Created: 2021-04-01 10:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7c98e4843a9eecaaa39921bb185d1011 SHA-1: 28255b99ea979463f273840e110de77459b34591 SHA-256: d5578b76ea77b24a9b2ca0b9dae0cb531ec3a9504138f8f9f55157683c562729
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://jottigo.ru/123?utm_term=crystal+report+viewer+logon+failed+im002 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445544/normal_6039366488354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_602a709f95b77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_60393cfe81a8e.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/3098347.pdfIn PDF document text
    • https://pofemazavuson.weebly.com/uploads/1/3/2/3/132303373/8629c18e572a6.pdfIn PDF document text
    • https://fijapirugonobi.weebly.com/uploads/1/3/4/3/134315317/8872474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421056/normal_6056776fa005c.pdfIn PDF document text
    • https://verukutuxa.weebly.com/uploads/1/3/5/3/135330203/gigofedijese.pdfIn PDF document text
    • https://gadolelexuzited.weebly.com/uploads/1/3/4/4/134486477/jologafeba_gojebababe_gexab_labetofuxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_5fd2c64770b24.pdfIn PDF document text
    • https://senaduwofajix.weebly.com/uploads/1/3/0/7/130775021/ca7bd8fd3a3.pdfIn PDF document text
    • https://dipabuxirakilat.weebly.com/uploads/1/3/1/0/131071076/2086995.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/nubepo.pdfIn PDF document text
    • https://jubamojeke.weebly.com/uploads/1/3/4/4/134432472/1535517.pdfIn PDF document text
    • https://jironomazubem.weebly.com/uploads/1/3/5/3/135393756/tigif.pdfIn PDF document text
    • https://dixawofira.weebly.com/uploads/1/3/5/3/135303501/4d23c7cba867904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450438/normal_600ff14a7b762.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/3424226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486758/normal_600f297bd6559.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/47a3f664-9daf-4201-8137-94523d4f09b0/51663606076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a367c07-d460-49b7-976f-727102b27707/taxivilakulebiximu.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_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 5792 bytes
SHA-256: db2be444d137d6cb257d493f00fe330fab38d7bbb6c416863210db3a8fba0791
font_01_sfnt_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 10884 bytes
SHA-256: ce9dd6eabafbe06eb3a08f01b241c2432b10afff9310309a53a305e7de7980f3

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