Malicious PDF — malware analysis report

Static analysis result for SHA-256 f722c93dc02b9b2e…

MALICIOUS

PDF

44.0 KB Created: 2020-11-08 20:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1edb607e839e5ec8e3df77db0a429927 SHA-1: bd8cfa5326cc86b54e5fff7861cfa504e2395e68 SHA-256: f722c93dc02b9b2e8d019c1674a240a1b646260f8dc9801133182ef8236f6d08
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many of which point to external PDF files hosted on disposable domains and redirector infrastructure. This pattern is indicative of a link farm designed to manipulate search engine results or to distribute malicious content. The presence of a known malicious redirector URL further supports the malicious nature of this document.

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://traffmen.ru/aws?keyword=beatrice+public+schools+parent+portal In PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/wejum_daratoruw_lunoriko_vipuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5f909ae9714e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_5fa21d6fc3a71.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/1775039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5f9a6020ce30d.pdfIn PDF document text
    • https://zovodexipelozas.weebly.com/uploads/1/3/4/4/134401167/3634170.pdfIn PDF document text
    • https://wejapofi.weebly.com/uploads/1/3/4/5/134590092/324a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f8e8bdcce624.pdfIn PDF document text
    • https://wagimudo.weebly.com/uploads/1/3/4/4/134475497/7067251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_5fa82e51cdbd8.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/f1e58e3a-fadf-426b-9be2-5baa0fca6f96/sojofuwutovew.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/words_with_v_and_q.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29c96693-4c1a-46e4-8ed0-a2a9911dc5d9/86201753295.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_off00006ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDD 5212 bytes
SHA-256: 2a4f07478ceb106060bfe2b6a4d57650baeb25361748621a062f36a3b6880df0
font_01_sfnt_off00007f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F83 10624 bytes
SHA-256: 7cb99cf6394569e2afccc17ea123b17c2f7ca07787eafc72cb7346016f4aeaf5

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