Malicious PDF — malware analysis report

Static analysis result for SHA-256 f011f14db519d3a2…

MALICIOUS

PDF

83.8 KB Created: 2021-03-08 00:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9777438ee7175be65b407664a7d92b52 SHA-1: 7591035cb7315fefb14d70e26aaefe01fdf766f0 SHA-256: f011f14db519d3a291a1cfc27a80b0d4ee881e205ce76add3ef68291c03b99cb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs point to various PDF documents, some of which are confirmed benign, but the overall pattern of link farming and the presence of a malicious ClamAV signature point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jacksth.ru/wix?keyword=ransom+riggs+tales+of+the+peculiar+pdf PDF link annotation
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/nijepomu.pdfIn PDF document text
    • https://vobawele.weebly.com/uploads/1/3/5/3/135334277/447873ee5be.pdfIn PDF document text
    • https://noturumon.weebly.com/uploads/1/3/0/8/130814868/c57164a1784.pdfIn PDF document text
    • https://sutogeva.weebly.com/uploads/1/3/0/7/130739298/xaduwisefa-puwobi.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/9334481.pdfIn PDF document text
    • https://vokewubepil.weebly.com/uploads/1/3/4/4/134443825/9540908.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/moon_phases_oreo_worksheet_free_printable.pdfIn PDF document text
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/xagilorekuv_koviw.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/what_did_marbury_versus_madison_establishgyznr.pdfIn PDF document text
    • http://mastericy-chistoty.ru/73276574513v2g9w.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/greek_root_words_worksheets_4th_grade.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/dixemolipobagugokiwumo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/current_events_quiz_answers.pdfIn PDF document text
    • http://mifevup.rf.gd/ny_post_bettors_guide_week_5.pdfIn PDF document text
    • http://wuwovedivaz.rf.gd/mri_anatomy_of_abdomen.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/wisuripe.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/alpine_cda_9884_e_manual.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_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 5576 bytes
SHA-256: abf55b38ab8f547a83bfbd30c3a6193b9a7f1ab15fd91aaa8d45f0c69febd589
font_01_sfnt_off00011eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB5 10460 bytes
SHA-256: c9c5d493a9dddc6a31c0185e24ec3b3814d830b3466193bf71c945db22d3af3f

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