Malicious PDF — malware analysis report

Static analysis result for SHA-256 2339cc84694a9bb4…

MALICIOUS

PDF

70.4 KB Created: 2020-11-18 22:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d498f0fc9b56eb1669f1a1f2c382c9af SHA-1: 752400fba57de6cb5734e05982312a9171755a54 SHA-256: 2339cc84694a9bb484910e6df368a360c8dccf8d58fcc97b27578ddabde73a86
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on various disposable domains, indicating a link farm or SEO manipulation scheme. Several heuristics confirm the malicious nature of these links, including a redirector link and a link farm on disposable hosting. The ClamAV detection and ML classifier further support the malicious classification.

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
  • 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?utm_term=bob+evans+nutritional+information In PDF document text
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/danuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5fad5b2989cab.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/gonumuxilalap_kupepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5fa7da9211864.pdfIn PDF document text
    • https://zuzatalo.weebly.com/uploads/1/3/4/3/134326893/9798134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_5f9f0f42c8127.pdfIn PDF document text
    • https://manabaxijex.weebly.com/uploads/1/3/4/6/134626004/2386319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5f9354f9d12c2.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/fevixuxapij_nogurenupir.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/69c9c6.pdfIn PDF document text
    • https://negotibuveno.weebly.com/uploads/1/3/4/7/134733978/lodadakigopetabos.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/27ed5e2.pdfIn PDF document text
    • https://popekuzukije.weebly.com/uploads/1/3/4/4/134471955/c6b7ce2904ff.pdfIn PDF document text
    • https://vukijimox.weebly.com/uploads/1/3/4/3/134358494/5804714.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/52252360-5962-4fd6-9e69-cc68ab2aee63/77298837472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24da218e-bf36-460b-a73d-9a28a0e624c4/fitbit_app_downloads.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_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 5164 bytes
SHA-256: dcaa91ab1c6b5560ceb456d869ac6b0dc3f969aa1236b48c621339114f02aac3
font_01_sfnt_off0000e9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DB 10268 bytes
SHA-256: 77c2a7ea74c49370c3f5b7950560294d72152861297bebf7f1d7ada0f26cbd41

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