Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a800123d4d5aea2…

MALICIOUS

PDF

77.3 KB Created: 2021-03-19 23:49:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d8411ef4264f088e1c4310c8b362fb6d SHA-1: ae9ac34d402c30dca8855ba0d603b5421090d173 SHA-256: 9a800123d4d5aea2da1681ac280aa55584c8f3a933093e40df5ce2437fd419c7
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a prominent one pointing to 'https://nipisod.ru/award?keyword=anemia+ferropenica+en+mujeres+embarazadas+pdf'. This URL, along with others, suggests a link farm or SEO poisoning tactic designed to attract users searching for specific topics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://nipisod.ru/award?keyword=anemia+ferropenica+en+mujeres+embarazadas+pdf PDF link annotation
    • https://cdn.sqhk.co/zatugudaxaji/gh4aX3w/transformer_g1_combiners.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493221/normal_60089b7315e65.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/idjifgj/78854557665.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/dic4idc/livezaxoraraleriw.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/hggWJja/download_free_wifi_calling_and_texting_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_604eb8f17bed5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402720/normal_5feeaf123201c.pdfIn PDF document text
    • https://cdn.sqhk.co/ronelejibir/dCjg2Yd/rawikex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455639/normal_6005ba568228c.pdfIn PDF document text
    • https://cdn.sqhk.co/mixasuwekov/hc7iJih/18536893800.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/ehpicjf/offline_fm_radio_app_for_android_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kemivabesu/cEidQYN/history_of_european_political_ideas_ucl.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/g6vcko3/67755014025.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/fbf90e90-e118-483a-9ace-ad984a71be79/ligelujidebutuf.pdfIn PDF document text
    • https://8459f3b7-b2e6-4b58-af31-5f29adf293b7.filesusr.com/ugd/a68450_4db0355d83594067b73860610607c696.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b3eca53-3fac-45a3-be21-2a12043feb88/flow_chart_template_symbols_meaning.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_4008cdeeaf60409abb73232989a16634.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba214fa-9cde-4898-9fb7-312bc06714a3/62096131038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc12106f-5437-4426-a4c6-f49fb92cdd05/raymarine_c80_update_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83daa39e-a213-41d0-bd4b-2d787f283432/are_protein_bowls_healthy.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_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 5524 bytes
SHA-256: 4aed68aca78c1b03d3434870094b80e0954c7c428957555c26eb7a3482e957e7
font_01_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 12180 bytes
SHA-256: 5291d8160122cb00f6574abff06d77257511489ced1bd4f947ccc5da171c99d2