Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80ecbc0b35bb708…

MALICIOUS

PDF

42.3 KB Created: 2020-11-09 13:02:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2bcfebb0165edf0d8684e2420ed50d48 SHA-1: 2b450b4b4ec04ee36227f59494b95329235587cb SHA-256: c80ecbc0b35bb70820d5ba00aa17345a2b29e5338a17b23d340a6267336b8921
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 1.0000

Heuristics 5

  • 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://trafficel.ru/aws?keyword=constant+term+math+meaning PDF link annotation
    • https://vozexipazaxa.weebly.com/uploads/1/3/4/4/134444785/8057131.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/6a802eed2366b.pdfIn PDF document text
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/3836453.pdfIn PDF document text
    • https://gebigimudixerez.weebly.com/uploads/1/3/4/3/134374499/4357640ee304.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/3cb113af6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_5fa411c3dae27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_5f9bfdc295d0c.pdfIn PDF document text
    • https://foxegakadop.weebly.com/uploads/1/3/4/3/134337736/pozudibakutul-tikefoz-zagupute.pdfIn PDF document text
    • https://fopezifu.weebly.com/uploads/1/3/4/7/134717551/mirod.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/7816856.pdfIn PDF document text
    • https://vujanakisa.weebly.com/uploads/1/3/4/4/134401771/regikumonari_tediniz_jiburobosupobuk_sezoga.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/3d4afed6-e2fd-42b6-90f5-7f3f473302ba/ndia_srilanka_hoje_partido_de_criqu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a99dfac2-c28b-489f-a3d5-6983a64d8f37/44285065800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f94e8d-7e3a-402b-b96f-f5c57a6f74df/prime_rib_roast_buying_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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50C7 4972 bytes
SHA-256: ed60faf67bbd584c61fa48bc03815dc126fcb3a9931712d2879894ba4fcae70d
font_01_sfnt_off00006180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6180 11092 bytes
SHA-256: 9be059e1e49b13318df50be8755c6a528cef0bbfeecdad191975f8b6804caba1
font_02_sfnt_off00008793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8793 16084 bytes
SHA-256: f6dd43097ff77a7644066d793246590a76b2fb03a803bff94e9fefcac70f68f1

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