Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da17e8c440fb917…

MALICIOUS

PDF

74.1 KB Created: 2021-06-10 03:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e9b3785ee1dc6e59626a7f451f788df6 SHA-1: 135ece45dab3639248bcccc47b8ce82a5999b6cf SHA-256: 1da17e8c440fb917cc6f86058ffe16d8d0def66a255384a7fef7efe35c6410d5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious or spam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/123?utm_term=catalogue+formations+arvalis PDF link annotation
    • https://bijuxoku.weebly.com/uploads/1/3/4/9/134901677/2308471.pdfIn PDF document text
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/govotenukakix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_601db9ccc3cee.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/416ee44.pdfIn PDF document text
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/35f2b599b8c13.pdfIn PDF document text
    • https://busununivid.weebly.com/uploads/1/3/4/7/134774072/ketefesumiben.pdfIn PDF document text
    • https://dofosigisez.weebly.com/uploads/1/3/4/5/134519942/7051929.pdfIn PDF document text
    • https://wironutoti.weebly.com/uploads/1/3/0/7/130739747/e2ccf8ba7f210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_601b30c4c4b8a.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/pitixe_xipisesijita_zoxutede_texoxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402520/normal_5fc9ebb05799c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lifelekufa.pbworks.com/f/ielts_pie_chart_sample_answer.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/w/file/fetch/144618330/best_survivor_in_identity_v_2019.pdfIn PDF document text
    • http://fozujedax.pbworks.com/w/file/fetch/144683619/the_chronicles_of_narnia_prince_caspian_book_review.pdfIn PDF document text
    • http://fuxijovipa.pbworks.com/w/file/fetch/144996825/xosule.pdfIn PDF document text
    • http://tulusozofel.pbworks.com/f/33247320108.pdfIn PDF document text
    • http://gifavipa.pbworks.com/w/file/fetch/144941607/new_ringtone_top_10.pdfIn PDF document text
    • http://kikipudojuzo.pbworks.com/f/anak_okey_plus_bedava_ip_hilesi.pdfIn PDF document text
    • http://kemuxin.pbworks.com/w/file/fetch/144554520/how_to_cancel_avast_subscription_on_iphone.pdfIn PDF document text
    • http://jobagej.pbworks.com/f/road_safety_quiz_questions_and_answers_india_in_hindi.pdfIn PDF document text
    • http://razodegotit.pbworks.com/f/27100121241.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/f/biochemistry_final_exam_questions.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_off0000e1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 5052 bytes
SHA-256: 9303dc6c3b13e9cd3b8c7066ad7e794d7b91e966da2776d2395a13b4269c4283
font_01_sfnt_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 12184 bytes
SHA-256: 2c3ca60536c292eeced5a7647a9ab8ff6adb1202328bbfc8e885ce3f31da30d5