Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e79b9a8d07bb37f…

MALICIOUS

PDF

78.3 KB Created: 2021-06-06 17:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 634f0f051dcad5d7e594e503f9272b38 SHA-1: 465c001086a7cd2d152a74ffa151ca5b15022296 SHA-256: 3e79b9a8d07bb37f78fd53601f10a11133161e1c6de3d2af0c5f0462fa580341
186 Risk Score

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 0.9990

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://synerhu.ru/pbw?utm_term=elementos+de+derecho+efrain+moto+salazar+pdf+descargar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401692/normal_600c856cdf7fe.pdfIn PDF document text
    • https://tugupititu.weebly.com/uploads/1/3/4/8/134887320/feboxalowatobo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365547/normal_5ff62e243e7ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376087/normal_60627c4faf2aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482619/normal_5ff1cd4b70d96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_602bf85facda4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420454/normal_5fc73fe9a1f66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_603c0aeb774d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414169/normal_6042e608a19ef.pdfIn PDF document text
    • https://sokonova.weebly.com/uploads/1/3/4/3/134322069/05c42713106.pdfIn PDF document text
    • https://lijipipixeralof.weebly.com/uploads/1/3/3/9/133999964/9599644.pdfIn PDF document text
    • https://folodekoj.weebly.com/uploads/1/3/2/8/132814523/jowuzef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_606e6153a41e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_606c5e275d4a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463812/normal_602ef22f3af10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5fd7b14c11dc0.pdfIn PDF document text
    • https://piroveda.weebly.com/uploads/1/3/2/7/132740505/19f298fd00413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476936/normal_606e275521ab9.pdfIn PDF document text
    • https://zewijevatijafat.weebly.com/uploads/1/3/4/2/134265582/kimazatozagobunanu.pdfIn PDF document text
    • https://kafazuvowimi.weebly.com/uploads/1/3/4/7/134705673/5647995.pdfIn PDF document text
    • https://lunidopufakim.weebly.com/uploads/1/3/4/4/134482460/4f45def16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8df67074-4de9-407b-9893-b17cdeed2bb2/taylor_kitchen_scale_out2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb550e9-e4d4-481a-a3f7-f6074071eea1/wibigirojudobovaguxosejid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86073968-bd78-4b3d-b5aa-56a16523c67b/rosemount_3051_quick_start_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 5364 bytes
SHA-256: a39ca43b90e3a8f44dc6d362f64eb1503176eb3c4501d93de576639cbbfdb922
font_01_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 11820 bytes
SHA-256: f06ec60a9f85f2a606456afa6951f491f1b207fff2a543b948570009b336c2c4
font_02_sfnt_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f