Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ad462c3b14291c…

MALICIOUS

PDF

66.4 KB Created: 2021-03-28 01:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7ad8bd7bd0cc3690df773ce0e7457868 SHA-1: 5afb02478a55646dff9439081412a259dea8422f SHA-256: 72ad462c3b14291c91b91b254accc23ecfbcef630faf184fd6d95573431159dc
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external URIs, with a heuristic specifically flagging it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of numerous external links suggests a phishing or redirection attempt, likely intended to lead users to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 5

  • 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 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://xajibur.ru/award?keyword=cdf+from+pdf+discrete PDF link annotation
    • http://wivevadevenumet.mywebcommunity.org/receptive_and_productive_language_skills_in_language_teaching.pdfIn PDF document text
    • http://urro-hu.com/85832070451g8cs.pdfIn PDF document text
    • http://cafe-cok.ru/loser_by_jerry_spinelli_chapter_questionst3gxh.pdfIn PDF document text
    • https://vesanalu.weebly.com/uploads/1/3/1/4/131482823/wonogope_pidedoziwezem_rizulebudusu_kibujafoburufo.pdfIn PDF document text
    • http://openchambre.xyz/79754133589tlo4.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/rabepanusuwap.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/what_are_technical_drawings_in_architecturegol6s.pdfIn PDF document text
    • http://sravniproxy.info/how_to_replace_canon_mx490_ink_cartridgekhxzw.pdfIn PDF document text
    • http://montana-media.com/buy_real_twitter_followers_that_retweetzgwy4.pdfIn PDF document text
    • http://successinyourlif.website/820294944339wiaw.pdfIn PDF document text
    • http://bamirajewenexo.medianewsonline.com/how_to_use_sundance_spa_control_panel.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/resumen_libro_secretos_de_la_mente_millonaria.pdfIn PDF document text
    • http://boevoenlp.com/listen_to_the_book_of_enoch_online_free4zuus.pdfIn PDF document text
    • http://brosbass.com/hindi_ginti_chart_1_to_100_in_wordszhl0k.pdfIn PDF document text
    • https://batuginuvitewaw.weebly.com/uploads/1/3/4/0/134013132/56b547fef349.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/7568996d-4f1e-4fb9-9fa1-75398151efba/27727824915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55564ab6-62b7-49d6-92bd-54b8723ac093/60320521652.pdfIn PDF document text
    • http://jigisasamupor.onlinewebshop.net/siminogu.pdfIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_0f358bb82d0049a59a0fc8e4b3aedc36.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78440139-5220-4605-b6f3-874a5e273ad6/prisoner_b-3087_chapter_8_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f6359c-0de0-4460-b677-50e137fca251/91598624519.pdfIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_90908b5bb74041c89166ed782949d72a.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_4ae0144ce2714ca5a379d6d0ee7cf6e4.pdf?index=trueIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_97d117994df64c48be7908082158de50.pdf?index=trueIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_b76ac51296944d1ba83f64d2a9a849e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6703843e-8e98-4828-afa4-ed8027e9fed7/absolute_value_functions_worksheet_answers.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_off0000c961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC961 4964 bytes
SHA-256: 454c4e5313e6c204a7ede2dc8a0205f7a568b2abf7fad03d4b2568e28c7547bf
font_01_sfnt_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 9904 bytes
SHA-256: 48957aad9e0f37babe41ce606d74eb427d65cec29443698d99a9e2a5d53598fc