Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb73cbb4b42c70f…

MALICIOUS

PDF

48.0 KB Created: 2020-10-17 18:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7084c8eac1f965677e0983eb2ff8c832 SHA-1: 9d141baa55918e5a741ee57ce5bc074b97211ecf SHA-256: fdb73cbb4b42c70f902b46af96ef2cc5e25e3ca43afd964795c79463a3e35b62
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary link directs users to a redirector URL that is flagged as malicious. This suggests the document is designed to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?keyword=convert+html+to+pdf+free+online+conversion In PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8980310.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/c0fcd04.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/5acab582ad41.pdfIn PDF document text
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/d6a726f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f870dceb6b37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5f8a13bcea776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f87166eed270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5f89b9809c745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f8774718d063.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/xududev-ledavodu-jatulivarolaxe-bixebenal.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/wogiselaruto-nokage.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/4b0f8f9662.pdfIn PDF document text
    • https://nosekuge.weebly.com/uploads/1/3/2/7/132740467/levono_kuketakati_parapag.pdfIn PDF document text
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/b1dbd00cc.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/0941fdb2-fcfd-43fc-bead-6c24928d549c/63370559042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b3d68b-e40f-4fa3-8e05-5cf149a3888d/64838495873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38e5ace4-d824-4f42-bec6-5af0a10389b8/19588652747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e08b4c8c-1788-4f9e-944c-e9187231b2cd/72362860884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2045b75a-abe7-45aa-9262-d05760a3831e/letexuzowofabufepipirelar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b14cfe1-2605-414c-9706-fee4d656af1f/91348097939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738a6586-9593-4332-9b8c-0f83364c985d/55609903307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef7fb399-8372-4bbf-9bbb-6abad34dab40/semewusuxobedojasig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fed614b-4f30-4c7b-b11a-173267f8b206/51990939722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d053fe61-e4b7-4d4f-b21d-aac556d441dd/65465080097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7eeb5e9-678c-4e5d-8996-f65ec26f16db/pozuxowibufekekewuvo.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_off00006ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFD 5056 bytes
SHA-256: 3dff1660d3be08c536aa82a2e2f7cf47c51d90fb8541f2d4af0385a1677d96d9
font_01_sfnt_off0000810d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x810D 10156 bytes
SHA-256: 95d2f4c7cd467edc1635fc3eea7cb81de6e59ab6df46a9ab24d22a6fc21b1528
font_02_sfnt_off0000a3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3C7 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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