Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc5431b224078a0…

MALICIOUS

PDF

71.2 KB Created: 2021-03-20 09:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0de47a6b68b3b9fe6913f0d5327b5743 SHA-1: cccebedeb01cc17ee39ebdc71eedb86d76c12124 SHA-256: efc5431b224078a0f3a9915148fb07e892c4daf3c225336d8739e891584046fe
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-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://lozipotod.ru/123?utm_term=odia+film+blackmail+song+hd+video PDF link annotation
    • http://zitupow.medianewsonline.com/ms_excel_vba_tutorial.pdfIn PDF document text
    • https://sejusidanixaj.weebly.com/uploads/1/3/4/3/134374441/bb07127aca415be.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/ab738250e.pdfIn PDF document text
    • https://nisuwifa.weebly.com/uploads/1/3/1/4/131453943/nolarekikofe.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/4282990.pdfIn PDF document text
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/guxoso-vugojorefi.pdfIn PDF document text
    • https://mugibamarenov.weebly.com/uploads/1/3/4/1/134109107/raparaxid.pdfIn PDF document text
    • https://cdn.sqhk.co/felodunom/ge2gifx/cake_batter_ice_cream_shoprite.pdfIn PDF document text
    • http://kofupum.mygamesonline.org/65593276319.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/eiasrih/52601077442.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_ed8e7d7667b74e7fbe6cadae52ae0209.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_1489a9d274af446d84255827635728b4.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_cc54931dbdda4155a2a5e312383040fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1847ac-4ca5-4fcf-856b-b378f39ef868/pokifiloganufoma.pdfIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_45f606ba50d542a0a28445e670025b9b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/564c9d4f-af43-4a7d-b44f-036b8b4a7882/pelavefiwire.pdfIn PDF document text
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_be877d965bd84cd1b0632a37d5283d9b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e68df891-9974-4a96-a6a3-1c24fc4cca6e/jofesolakovubomevonijom.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_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 5632 bytes
SHA-256: bd37c36ca27ae1a4c4f1fc21c5af58a7867a688792d375a17c6c0066ab7b5ddb
font_01_sfnt_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 10520 bytes
SHA-256: d07662919bbb96df271a40954b17fabb088b5eedcf413d1c02d83acda645472c

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