Malicious PDF — malware analysis report

Static analysis result for SHA-256 4281e6f569a329b8…

MALICIOUS

PDF

72.3 KB Created: 2020-11-17 01:39:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e65c01dffe42279ce6d3c99af6fc8342 SHA-1: 9d2911477f9e1c9d0225e799f77a35bf8d4a9364 SHA-256: 4281e6f569a329b8dc2e23f6ffb750f9d70da2bede4fa8770ce6081db6d2b596
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 0.9998

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://trafficel.ru/123?utm_term=pokemon+go+calculator+level+40 PDF link annotation
    • https://lifusapemar.weebly.com/uploads/1/3/4/5/134526201/f16da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_5f973d01b0686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489979/normal_5fab4f119f709.pdfIn PDF document text
    • https://paripipedaninez.weebly.com/uploads/1/3/4/4/134444050/dibamaxig_baxuxupiwamorir_menijagiforu_zimupawexedu.pdfIn PDF document text
    • https://bufibefoxoxopij.weebly.com/uploads/1/3/4/4/134489975/6754407.pdfIn PDF document text
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/507774.pdfIn PDF document text
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/ffa66d1.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/pigix.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/11db142a-ba09-431c-9634-916cfb60b7de/gakenew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f22dea-d650-473c-a8c2-2d59449f7d5f/rawep.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/tuluf.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/vexuguxojezetikexagop.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/mawejesowitofenog.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00E 5132 bytes
SHA-256: 846a7c04d46d5d9b9e2048169f7b7cdfc08f7fd6d619de120c08c0fe8bfa9f3a
font_01_sfnt_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 11272 bytes
SHA-256: 2154c545493e9bf303130708e313904ca650223c0dfc2c6860e48bba48f616c7
font_02_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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