Malicious PDF — malware analysis report

Static analysis result for SHA-256 c160f879faeea302…

MALICIOUS

PDF

74.5 KB Created: 2021-02-11 18:33:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 19aae44abd4a489ec1273f4aa9a573f0 SHA-1: 3596e55ba538853a4466b005c382efe2f285f2b9 SHA-256: c160f879faeea302c96cceca9c56a35e6e4854273a605c6720d31d38dd1fb94f
126 Risk Score

Malware Insights

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

The PDF file is classified as malicious by ML and ClamAV, and exhibits characteristics of a link farm on disposable hosting. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to graphic novel creation, which is a common tactic to disguise malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/123?utm_term=how+to+make+a+graphic+novel+on+google+docs PDF link annotation
    • http://tehnoprom.org/sprinkler_irrigation_system_componentsco4nl.pdfIn PDF document text
    • https://lapawiniposa.weebly.com/uploads/1/3/5/3/135323982/zuleja.pdfIn PDF document text
    • https://durafozo.weebly.com/uploads/1/3/0/7/130740533/remularegij_megubin.pdfIn PDF document text
    • http://netewe8.xyz/funosavumokixipuviminuwuyelf7.pdfIn PDF document text
    • http://community-day.ru/fagubelnmz0s.pdfIn PDF document text
    • http://classkaod.ru/colt_ar_15_instruction_manualseeat.pdfIn PDF document text
    • http://freud.icu/the_attitude_change_model_assumesz84ok.pdfIn PDF document text
    • http://kartaidatodemeleri.com/diamond_microdermabrasion_manual9b1dj.pdfIn PDF document text
    • http://laitlabs.pro/jevuzijasexasaremutog3tgam.pdfIn PDF document text
    • http://localdesign.me/english_grammar_book_10th_classbkrk6.pdfIn PDF document text
    • http://vopipiji.iblogger.org/deerma_f600_user_guide.pdfIn PDF document text
    • http://lazerepil.site/akashaganga_2_trailer5x2la.pdfIn PDF document text
    • http://damvglaz0.xyz/vituzalejupuboxinadunzyco.pdfIn PDF document text
    • http://awpmode.com/conservation_of_biodiversity_filef1ois.pdfIn PDF document text
    • https://fuzipoxo.weebly.com/uploads/1/3/0/8/130873840/bovivudera_potusesuget.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vugikalijuboxo.epizy.com/simple_accordion_jquery_free.pdfIn PDF document text
    • http://reduxaxu.epizy.com/wamopajanaxeveruf.pdfIn PDF document text
    • http://boligasenupe.rf.gd/gattaca_analysis_questions_answer_key.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_off0000e3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 5664 bytes
SHA-256: aecaad72f8c40379383e0b6179b946654d1eae33b2f65a8eb61f9f70ed08f3f1
font_01_sfnt_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 11044 bytes
SHA-256: 0b727b76082f6ebeffc8eb5ef9f9d757c1f0eef4c5f49403feb89d83f807aaba

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