Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb78b08ba5adcb8b…

MALICIOUS

PDF

75.7 KB Created: 2021-06-07 17:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 68b20c874d6316276249e1dad21714d7 SHA-1: cfb9743cc209c522c4729f673d0eaf49fc63007a SHA-256: cb78b08ba5adcb8bdda76655908e44a80fc130b39b720dcf98c38cbb4e9a7a86
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the presence of a link farm with numerous external URLs, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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://smidgel.ru/pbw?utm_term=blues+scale+bass PDF link annotation
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/xokofexozajeragega.pdfIn PDF document text
    • https://kadimonadi.weebly.com/uploads/1/3/4/4/134491006/varifetowod_lukof_gukokik_pilov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_603c774165927.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384461/normal_60069c2f1bad0.pdfIn PDF document text
    • https://kapiromus.weebly.com/uploads/1/3/5/3/135345701/9936878.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5ff09b689a983.pdfIn PDF document text
    • https://pijuvadugodawa.weebly.com/uploads/1/3/4/3/134307721/530392.pdfIn PDF document text
    • https://wezusutuxalik.weebly.com/uploads/1/3/1/6/131637092/7276320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498882/normal_605990e36a20e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476767/normal_601ae42f0bb38.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/2d56a81d-7bbc-431a-9f0d-5874684a4e4a/sat_subject_test_hong_kong.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5014cc1-1a9a-4ca7-b843-df2b8cdca3fb/leadership_northouse_7th_edition.pdfIn PDF document text
    • http://pobonagul.pbworks.com/w/file/fetch/144468732/fudulatemabonodevixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9891b9e4-1319-42b2-9eb8-5405792866a8/past_simple_and_past_continuous_exercise_with_answers.pdfIn PDF document text
    • http://nibenaxibot.pbworks.com/w/file/fetch/144794820/85881567183.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/how_to_pass_rn_nclex_2020.pdfIn PDF document text
    • http://zusemivak.pbworks.com/w/file/fetch/144534450/glencoe_accounting_working_papers_answer_key_chapter_11.pdfIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144595446/nikuvodaburam.pdfIn PDF document text
    • http://vomuseteweto.pbworks.com/w/file/fetch/144685887/82565797535.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/amharic_bible_commentary_free_download_zondervan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1212d083-5270-4aa1-8435-dc183a5c683d/16928927425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abf5905-991c-453f-939d-8a386c94d3fc/22078729006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd4c580-da19-4df5-9816-84184561503a/wolf_of_wall_street_margot_robbie_salary.pdfIn PDF document text
    • http://nukuxim.pbworks.com/w/file/fetch/144701307/transformar_kilometros_a_millas_nauticas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/875f57b3-2989-4898-81d2-7ee9542e1dac/wejukoruvodunenane.pdfIn PDF document text
    • http://kigemulu.pbworks.com/w/file/fetch/144693564/daviss_drug_guide_for_nurses_17th_edition.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/33155403882.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_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 4884 bytes
SHA-256: 1220925015b636190b2b9fb659d07eb88b63a3ee366dd7eb3671b32ff0c49ece
font_01_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 11520 bytes
SHA-256: 2e1e0b3a7aae2dcfff85d1dab2f481272a5ee08a85321df3b60d73c19608753a

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