Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c83ad78c063982…

MALICIOUS

PDF

75.5 KB Created: 2021-04-12 09:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e46142c48324659667c3f8e0736f2a0c SHA-1: 2c311643ef9dcbb23c4d85d7dcce07f9a7356bb2 SHA-256: 61c83ad78c063982bf5b886a17c0d88e74037084cebce175eff12f48b1e0403d
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=what+is+gni+per+capita+atlas+method PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382407/normal_60494616cfd3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422897/normal_606e304798022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_606528f94b2e9.pdfIn PDF document text
    • http://jaxixojuko.mypressonline.com/gufodolunofetuforumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_602b968b721e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_600b6747897b8.pdfIn PDF document text
    • http://revodegasiger.sportsontheweb.net/13193589794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488556/normal_5fda2865df85b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_60535b2e9d119.pdfIn PDF document text
    • http://mimivudarevi.scienceontheweb.net/nasaviguxafenura.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366003/normal_5ff676417c91b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464539/normal_5ff61836202a2.pdfIn PDF document text
    • http://wajofima.mywebcommunity.org/surface_area_of_all_geometric_shapes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxuzaridob.onlinewebshop.net/48721079071.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_bc9fb01fc0e94fffa2485e547ddf3dbd.pdf?index=trueIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/obstructive_sleep_apnea_questionnaire.pdfIn PDF document text
    • http://wukevivetarapu.myartsonline.com/dugizi.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_6e91d75bc2ae40df87e206e26c0a41cb.pdf?index=trueIn PDF document text
    • http://naxefugoxodikow.atwebpages.com/nuduwetanipifilamode.pdfIn PDF document text
    • https://37b1cabf-41b6-4e27-befa-0fe7335ed416.filesusr.com/ugd/9d05b5_701401f478b3449b9b1ba3381a7bf4ba.pdf?index=trueIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_4d7850ec85094c2da2ad0cd142efc4df.pdf?index=trueIn 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_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 5500 bytes
SHA-256: 75d449e530374d05e710ea000482fb86f169620837849124bb7b8f1ac8079b62
font_01_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 10948 bytes
SHA-256: 18743395c49d71c5ff3bfee98147a93e961d1d9f7c9f70e23d532f7cc52879d2