Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca4872f5407f375…

MALICIOUS

PDF

80.9 KB Created: 2021-03-15 00:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b9e8e46392733ef9fbecd41671b5983 SHA-1: 2f43a729b9fe18ebacb5f4a87e267786dc387d14 SHA-256: 0ca4872f5407f375513517c1d6f9bedb4de101c2e11f4d0caa54e5c988423f66
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://pelibifir.ru/strik?utm_term=what+does+222+and+555+mean PDF link annotation
    • http://coloradocustomelectric.com/ginigofulhsu7c.pdfIn PDF document text
    • http://yildirimotobursa.com/review_buku_the_magic_rhonda_byrnexj08l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481157/normal_603af0adb8221.pdfIn PDF document text
    • http://kurixuj.sportsontheweb.net/.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/3680ae45cbcd1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451549/normal_60330863c9e95.pdfIn PDF document text
    • http://clipshd.design/flower_artificial_jewellery93yk1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_5fe6ecf367a9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_602bf9cf3e758.pdfIn PDF document text
    • http://pro-gram.pro/why_is_my_keyboard_delete_button_not_workingfgbnb.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/52005821324.pdfIn PDF document text
    • https://fegowudabe.weebly.com/uploads/1/3/1/4/131438077/xebosatavatobipaw.pdfIn PDF document text
    • https://newewakezodem.weebly.com/uploads/1/3/4/6/134680802/dimigofevil.pdfIn PDF document text
    • https://nopubogap.weebly.com/uploads/1/3/4/6/134667077/de4fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422876/normal_6022cb507090b.pdfIn PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/a78b1065125.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_dad5dbbf7cb742349fb124632c6e58e6.pdf?index=trueIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_f0cad99aa111439d83e54200244cf6e6.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_7e8beb65277d4e1c9765a8536169739a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/invitation_letter_china_visa_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/32103305456.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_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 5204 bytes
SHA-256: 9ac1ce3b1e350567bd157b3c28cad102254e7001eb0543e7e7e59b41af0b79ed
font_01_sfnt_off00010b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 12804 bytes
SHA-256: 61d03ca4e68eb90693e6f17eb025c541b4ee5fa53b395589d11c70ff28ea6b21

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