Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a74011846a3c697…

MALICIOUS

PDF

80.7 KB Created: 2021-05-21 01:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 04abc3d58c0d434eb7d92d27d08a623f SHA-1: f08ee2778d01a485006cc3a2ea2878aec770512f SHA-256: 1a74011846a3c6971a9d0d048a91d35bce9679154bbd9121950996751caa5c96
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://vilenefex.ru/strik?utm_term=excel+chapter+2+in+the+lab+2+sales+summary+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488336/normal_6011991688335.pdfIn PDF document text
    • https://vixikubinimagap.weebly.com/uploads/1/3/3/9/133997110/dutaxofumami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450638/normal_600eabb8502f2.pdfIn PDF document text
    • https://gulurevipad.weebly.com/uploads/1/3/5/3/135349864/8825954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_604065d521001.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/gizoluvumi-kegok-jezibafavuva.pdfIn PDF document text
    • https://rumirasikimuzib.weebly.com/uploads/1/3/2/7/132710795/9322427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456686/normal_5ff885870dec3.pdfIn PDF document text
    • https://daxosunusopudom.weebly.com/uploads/1/3/4/5/134510034/4602990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474471/normal_6055fea80c8f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_602c740fabbb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_602c0839a4492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477181/normal_5fc94e3c4377c.pdfIn PDF document text
    • https://lijimoxa.weebly.com/uploads/1/3/0/9/130969704/a61bff44781e49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_60318b40b616d.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/eb75d369-e737-4f6e-a12c-30f8e47e0e5b/craftsman_125_psi_air_compressor_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b08a011-b6be-4f14-9075-abb51b834e35/sodevatateg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f655dc9-9e87-402b-b76d-87dc7af5b6cf/bergeys_manual_of_bacterial_classification.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_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 5728 bytes
SHA-256: 50878159c67cf8b765994f8efbc6464d799b3d6ab764beeaf34175ea3ac018e3
font_01_sfnt_off00010f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7D 11084 bytes
SHA-256: e91d4d092e0a39d2a8b6068b1c105d45e5e5e26a2c44ef183a7d1d2e2f42ee38

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