Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b802285dea53fdf…

MALICIOUS

PDF

74.6 KB Created: 2021-04-22 07:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d82f0f7a81e8ce74cb09301318261dea SHA-1: 21fc4a998b800a73946fc6bc02187266bad65b6f SHA-256: 9b802285dea53fdf64b00affe922aa238140c6244efcc9c16849a7091e3d4da6
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to link farms and at least one known malicious redirector. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to potentially harmful external sites, likely for phishing or SEO abuse.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+are+the+10+methods+of+teaching In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_604ae7c029303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_6041698b75424.pdfIn PDF document text
    • http://options.expert/les_cellules_sanguinesp12vv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_6037940419bd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385847/normal_5fde120b1fa60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453560/normal_603db9b8de7fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_603b3566135af.pdfIn PDF document text
    • http://myfoxing.online/tuderizejojefozirevefovubbm9y9.pdfIn PDF document text
    • http://videohost.space/tp_link_powerline_wifi_dropping_connection5mdrg.pdfIn PDF document text
    • http://kartaidatodemeleri.com/jabolejabesatijimowirajvdd7j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451047/normal_600541bf974bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_d465c5d6852847c792ce480f39631766.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76a70461-df2b-47e1-b222-cef73b3552ad/do_you_capitalize_high_school_in_a_sentence.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/sign_of_the_beaver_chapter_15_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/zurutilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9da04dd-bd5b-47c3-98fe-ac8985c4f4d0/tobaxaruvokunot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/784527f5-a172-4c4c-b19c-a770f6ab1c25/titigogubujisamogadodot.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/lifonogopotonimele.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/sudivapezuj.pdfIn PDF document text
    • https://df867d32-629d-4b48-af14-2fc5df20f827.filesusr.com/ugd/287761_9e0ee3984edd426aa7b8e9dad4f50516.pdf?index=trueIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_394c4abf1a7145b6a104eb65a457f189.pdf?index=trueIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_8e85fe46fb6741dfb4b919d30fbee984.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_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 5608 bytes
SHA-256: c7c896aab926f08c113e3cd5cf62b8d9d8681e775c2990e87a234c4a991850b8
font_01_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 10672 bytes
SHA-256: d264a93d7e482e7bfd02e8539537e72ee570baa66b218b32602f2151746f8c57

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