Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6fa34fd8db07eb…

MALICIOUS

PDF

71.9 KB Created: 2021-03-26 08:14:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dc20cedd9c143649e7427542ba6889ea SHA-1: 800d1b8e9fc19669f4ef784010a376dfdc38b57b SHA-256: 1c6fa34fd8db07ebaa2cf73acf4f3157c16e584e8872003a4eeb1e71d2936ddb
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-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://vilenefex.ru/123?utm_term=hazing+prevention+student+success+answers PDF link annotation
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/4701d.pdfIn PDF document text
    • http://contarinihome.com/iso_22000_fssc_22000_unterschied4m6i4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403283/normal_5fcf29198a37e.pdfIn PDF document text
    • https://mixenabunagoxo.weebly.com/uploads/1/3/5/3/135320093/8266343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5fdb5f869bbbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370097/normal_5fec837b12653.pdfIn PDF document text
    • http://robolab.one/73814328733v71s9.pdfIn PDF document text
    • https://volinamonapefez.weebly.com/uploads/1/3/4/4/134494747/bodisu_zeman_xojoga.pdfIn PDF document text
    • https://meliwuka.weebly.com/uploads/1/3/2/7/132740471/7444118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411481/normal_6034ca6797bea.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/7049136.pdfIn PDF document text
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/rejetike-nikajow-judixupebege.pdfIn PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/simuvexebaniruj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zesotat/calendario_2019_con_festivos_para_imprimir.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/51751283523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80f7e2a-3851-4b3b-b6ed-5b87576f3833/the_twilight_saga_breaking_dawn_part_2_soundtrack_list.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/55215517938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f6cea6-0ee3-4554-a80d-aef37f36cce1/26489237567.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/equifax_credit_report_integration.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_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 5372 bytes
SHA-256: 9239d5d8cb12f2d5286fc3a0345ad145584e35e186696b48df24cccdcb6a1c1d
font_01_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 10976 bytes
SHA-256: 61ef409b4d42bfb22c9b54e3657c4d832051961887580c0a257b22b3b449e741

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