Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf9f0f08e3d2fdc…

MALICIOUS

PDF

79.3 KB Created: 2021-03-19 18:02:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 980a42e0f0e1bbed8bde04d96cc8b7ea SHA-1: 9ed6b9deb97cf61d82906070d7addc1d98b3c014 SHA-256: fcf9f0f08e3d2fdcbddfdbfe89d7742607ecc69db775d981cb0af8da17c48453
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are associated with disposable hosting and link farms, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using numerous links on potentially untrusted domains to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/wix?keyword=canon+4400f+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450041/normal_5fd69d921bb42.pdfIn PDF document text
    • http://mstmail.space/zadumawalozujorotogaperukw2lt.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/integral_calculus_university_of_sydney.pdfIn PDF document text
    • http://peskomment.ru/formal_dress_hire_shops_perthdm6g0.pdfIn PDF document text
    • http://bunnygummy.ru/68687822155tqlvm.pdfIn PDF document text
    • http://roflan.site/rimepamogediwatowm6rfs.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/tamil_to_english_learning_books_free_download.pdfIn PDF document text
    • http://prostotit.site/porque_sale_una_piedra_en_el_rion5yue0.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/finnegans_wake_rockville.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366033/normal_5fe418e14818e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423429/normal_5fd065407722b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_60087a8c1bbf6.pdfIn PDF document text
    • http://lakegefufen.scienceontheweb.net/59402715416.pdfIn PDF document text
    • http://nat-fru.space/21366486878h504q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384633/normal_5fdf0808c6dd8.pdfIn PDF document text
    • http://folejaf.mypressonline.com/dichotomous_key_worksheet_year_7.pdfIn PDF document text
    • http://spainsale.pro/70464864802lymz4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poxelisenaxoxig.epizy.com/papetodipumelubalijo.pdfIn PDF document text
    • http://lamupilabixekuw.epizy.com/iti_college_admission_form_2018.pdfIn PDF document text
    • http://bawavejukedosuv.epizy.com/byju_s_apk_mod.pdfIn PDF document text
    • http://bubaregelore.rf.gd/love_song_of_j_alfred_prufrock_quotes.pdfIn PDF document text
    • http://fekimemisuj.rf.gd/des_livres_pour_apprendre_l_anglais.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_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 4772 bytes
SHA-256: 81f73e2682111657206ce9642dd10b13dcdaf8da03bc5c16fc779fbcfbfa923d
font_01_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 11196 bytes
SHA-256: d4957ccd8f11b7a93e4ef66e0c60e7d77f1c090318c0728705a3d4faad693e49

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