Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fe2def61283460…

MALICIOUS

PDF

100.8 KB Created: 2021-04-11 02:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0090d995a13148706101161296cd1b02 SHA-1: b719dc3c12c52b947f2f832f3b9b7d182511f0e9 SHA-256: 13fe2def612834605a4a74e5ae3cc117a549d6b45e684b412a5206421eec9174
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=rising+of+the+shield+hero+season+2+censored PDF link annotation
    • http://lnstagram-copyright-supports.com/mazogor31d.pdfIn PDF document text
    • https://furamakivagoj.weebly.com/uploads/1/3/0/8/130814247/topaxazimu.pdfIn PDF document text
    • http://butinejijobu.iblogger.org/31436603336.pdfIn PDF document text
    • http://zanartcc.net/26792900218o904y.pdfIn PDF document text
    • http://pukazabix.22web.org/b._el._ed_form_last_date_2019.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/2959531.pdfIn PDF document text
    • http://kevesojesofun.22web.org/51698895790.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/suxomux.pdfIn PDF document text
    • http://kismyketio.com/30651715216l8yau.pdfIn PDF document text
    • http://amsidisi.xyz/251272624840h5co.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wutogiku.epizy.com/building_information_modeling_for_dummies_download.pdfIn PDF document text
    • https://e4dd5bf8-bd13-43e3-b37b-9624b2564f03.filesusr.com/ugd/093416_3ce38cce6eda4426ba26506702948d51.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_671a73448cdd49b79d6a6ad2a7c6f50e.pdf?index=trueIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_c5c1d277da624ff9b6a16c729cf579f4.pdf?index=trueIn PDF document text
    • http://soripewanadu.rf.gd/78607129300.pdfIn PDF document text
    • http://zadajipi.epizy.com/57212817333.pdfIn PDF document text
    • http://voradalupusar.rf.gd/46688665540.pdfIn PDF document text
    • http://roxanotox.epizy.com/48759490658.pdfIn PDF document text
    • https://00e6f838-d17c-4130-b616-1adf5f4d9bb3.filesusr.com/ugd/714321_86539e0b1bae4e689a5d166c382efebb.pdf?index=trueIn PDF document text
    • http://nopitoweda.rf.gd/tracing_letters_free.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_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 22004 bytes
SHA-256: 1b08209c071704c39772776837cd4deecbce5d95d37cc398b8c2c80ec1cb784e
font_01_sfnt_off00014c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C67 5424 bytes
SHA-256: 3c0c269388c2ca6888ec51f33ab8ed7a011f0071df95c8f485d325f7ff3f303b
font_02_sfnt_off00015ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED7 11392 bytes
SHA-256: eeb8e52a6bcac722f8d0b7110a639ce1b338546621eecc5bda067e1825ed4000

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