Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d884d0487a5ce0…

MALICIOUS

PDF

85.3 KB Created: 2021-05-29 04:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 82bb08ac8f55d97e563f4887f826982f SHA-1: e4bf3f37a712482e90dd25b6d207258d461660f3 SHA-256: 18d884d0487a5ce02be3b46d2360834ae7052c62550372977f7ca808e8cfbfa1
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/123?utm_term=criminal+background+check+form+ontario PDF link annotation
    • https://javekulu.weebly.com/uploads/1/3/1/8/131872149/4581711.pdfIn PDF document text
    • https://dotofufodil.weebly.com/uploads/1/3/5/3/135313806/losapivekisipubax.pdfIn PDF document text
    • https://molilavavabofu.weebly.com/uploads/1/3/5/9/135989114/misodowidokusunutuva.pdfIn PDF document text
    • https://xinuluparos.weebly.com/uploads/1/3/0/9/130969110/8f35d7a98a9ccce.pdfIn PDF document text
    • https://dumuzuvo.weebly.com/uploads/1/3/4/6/134695275/ddfe975fab054c.pdfIn PDF document text
    • https://geworusidexaj.weebly.com/uploads/1/3/5/3/135306562/7297706.pdfIn PDF document text
    • https://sorudexene.weebly.com/uploads/1/3/1/3/131384015/3241032.pdfIn PDF document text
    • https://zafojulokigod.weebly.com/uploads/1/3/4/7/134741370/sodusogovijali-wexeromozuxem-bovikinisobevi-wibibite.pdfIn PDF document text
    • https://pigegiwoxare.weebly.com/uploads/1/3/5/3/135385020/a7e6a79cbcba78.pdfIn PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/9588247.pdfIn PDF document text
    • https://naluzamuro.weebly.com/uploads/1/3/4/5/134516405/69732.pdfIn PDF document text
    • https://ziperivowupidu.weebly.com/uploads/1/3/1/3/131381589/937a4.pdfIn PDF document text
    • https://dumuzuvo.weebly.com/uploads/1/3/4/6/134695275/a444a94.pdfIn PDF document text
    • https://vebupixe.weebly.com/uploads/1/3/4/8/134854050/b977e489.pdfIn PDF document text
    • https://jawavovamote.weebly.com/uploads/1/3/4/7/134748122/1e83c3.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/43b2c5fa-7ab5-47aa-b7c3-1e56cfa872fa/soxunusiraxug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990ae288-2166-4751-b28a-18ac17e1a651/sovovupixosimosodowepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26080eb8-fcb5-4098-80c1-6ded4225268e/gosetivupisakej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/911884c0-3c3e-40f6-8f31-fa30d83fae5d/sharp_aircon_remote_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/415d70b6-e255-4f8b-9283-7c3ab78fe3fa/poveworipuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22a9ad60-719b-4fa2-9c8a-8cc6d152443d/53420240035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00afe14d-5880-4a63-8b8f-0add1502b79c/13656759059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ff8e7f-a456-4986-bc46-ce8f1da8f07e/how_do_you_clean_a_hoover_spinscrub_50.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_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 5368 bytes
SHA-256: 01a90ef5b1eb2bbf3dbf27b031f4ef99c1e1e06308ab5901f8f49a774295f1e4
font_01_sfnt_off00012232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12232 10960 bytes
SHA-256: 58290d0913aec4b197bab514d9f6b54c3f33aae34a5e494482fcedb01666b520

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