Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa4f63ad627a4d8…

MALICIOUS

PDF

141.4 KB Created: 2021-03-19 02:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f00cd9d892b26d053be12365ab4f70c0 SHA-1: c3339d65cf988ffccddca1db9c2e85882a195067 SHA-256: ffa4f63ad627a4d8d24c8ddc5c0b938ed70b719d4e1006757f7729e1e2616e96
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, maypoin.ru, is associated with a search query for a specific PDF, indicating a potential phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://maypoin.ru/award?keyword=abraham+joshua+heschel+the+sabbath+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459916/normal_603452b1e13a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_5fe8248ae8c62.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/lujijok-fanuwo-bidedop-fugej.pdfIn PDF document text
    • https://gudixujoxidiziz.weebly.com/uploads/1/3/4/8/134857074/1051124.pdfIn PDF document text
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/daforizixebosip-mukubuxojewowo-vosubabubodosud-katukufonovude.pdfIn PDF document text
    • https://gapuromediwav.weebly.com/uploads/1/3/0/8/130814643/1ee5f645750c6.pdfIn PDF document text
    • https://gidepojijozi.weebly.com/uploads/1/3/4/2/134235950/abcd637cf4fcdd.pdfIn PDF document text
    • https://xurebutira.weebly.com/uploads/1/3/2/6/132681359/memazu.pdfIn PDF document text
    • https://jonilokakowoso.weebly.com/uploads/1/3/1/4/131453896/zawupakajasafosawiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444113/normal_6049d3ff34a79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498971/normal_60479d3eb1ead.pdfIn PDF document text
    • https://puwexisafiza.weebly.com/uploads/1/3/4/5/134586360/fadulabisaralu_jimosowabuwusuw_fezadorusad_jeladifoxuwajuf.pdfIn PDF document text
    • https://widijusadapabi.weebly.com/uploads/1/3/0/9/130969823/1949437.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/9a503711-1754-4cb9-93d4-fdb5e49abe4d/35655342647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d3bb2a0-351c-48c4-a028-cbea024d7a8b/worksheet_1_dna_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d53510-e21d-4910-90f5-071efb2fc97a/sugobeleruxux.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/73485498319.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/zatokime.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/33212250678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548def77-6120-4c01-86b3-56b790987002/nedebikafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3173e966-abb1-4f60-ad09-28ebd12e5224/18768540360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c7b53a-a439-4fd5-9b2e-aa4538f3039c/4987267728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99cdf5b7-6cef-49c5-b027-68d71f2e547a/rexuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715b0e1e-d406-47fb-a166-7f6e49c8548c/69477824421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef7df44-f18c-4957-8fea-9f961100230a/fijogirafiki.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_off0001d827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D827 5600 bytes
SHA-256: 4e8a06e0811517f1d71b628efe27f94bdf87416621c09ce4d6cc6c3377c23cdf
font_01_sfnt_off0001eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB01 12580 bytes
SHA-256: cfd408a5db3307d1005d66e58715dc08316464662bd74cd42e2e80dbf7bc3cee
font_02_sfnt_off00021258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21258 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d

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