Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f7d78a0a802b49…

MALICIOUS

PDF

74.4 KB Created: 2021-02-15 17:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4c66daedf193bea21a6d79e1729e0350 SHA-1: 5daf209a9c03e77802f14cb362443f980caca5ac SHA-256: f8f7d78a0a802b4917cf99559a572b47a2be53a97df36ddf8cf88708bfdc1c15
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains numerous embedded URLs, many hosted on disposable domains or link farms, suggesting a phishing or redirection attempt. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to host links to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=alinco+dx-sr8+modifications PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417029/normal_6027601c403e7.pdfIn PDF document text
    • http://jebumivusesujan.iblogger.org/61873885545.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fcf87430d4ed.pdfIn PDF document text
    • https://tizijepen.weebly.com/uploads/1/3/4/2/134234944/repirod.pdfIn PDF document text
    • https://wetusaseri.weebly.com/uploads/1/3/5/2/135297966/ruputas.pdfIn PDF document text
    • https://xigobiniliw.weebly.com/uploads/1/3/5/2/135298108/c5fa499f9f3.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/467107.pdfIn PDF document text
    • https://pitefomut.weebly.com/uploads/1/3/2/6/132682610/d8be832.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/JAgajjf/zepex.pdfIn PDF document text
    • https://cdn.sqhk.co/nakotuba/mjcSAia/25683977228.pdfIn PDF document text
    • https://bupuvebawa.weebly.com/uploads/1/3/2/7/132740405/wekinig_ritefaj_rasene.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/jjKjjkj/au_mix_b_n_trung.pdfIn PDF document text
    • https://cdn.sqhk.co/dubagelojuwe/iihcHge/cowboy_vs_zombies_games_for_pc_free_download.pdfIn PDF document text
    • https://zekedijudanafow.weebly.com/uploads/1/3/0/8/130874467/zukepovan_nekemax_robaxiwulisof.pdfIn PDF document text
    • http://ketuzel.22web.org/create_iam_policy_cloudformation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sobikunukozi.rf.gd/60151452379.pdfIn PDF document text
    • http://luwegovufa.epizy.com/76530837035.pdfIn PDF document text
    • http://wobemiko.epizy.com/summersville_lake_climbing_guide.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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 5120 bytes
SHA-256: 5bd9987c5dcf3c9c8af6f26b47d9b202b35fd6af1982d485622441da674fcb90
font_01_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 10412 bytes
SHA-256: a4eae2704837ae7a88cf2eaf917f77c237de268166f09cbde953d62e8b10768e
font_02_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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