Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c7e5961fa653df…

MALICIOUS

PDF

77.0 KB Created: 2021-03-25 14:28:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 91a9f5393dc1580fad4e75ab4f7d027d SHA-1: 1f03101d47bcc7c4126e736ea66e51aa4eb10860 SHA-256: d8c7e5961fa653df0aa3f433c5e4357378d53ae2facfdadcf088873f4c3b9d4f
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing attack.

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://nipisod.ru/strik?utm_term=how+to+use+my+element+tv+without+a+remote PDF link annotation
    • http://dusejetiwogodad.getenjoyment.net/boolean_algebra_symbols.pdfIn PDF document text
    • https://lomedalepa.weebly.com/uploads/1/3/4/4/134438906/6843981.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/attack_on_titan_wiki_season_4_episode_2.pdfIn PDF document text
    • https://rokawutavepuma.weebly.com/uploads/1/3/0/7/130776645/4912043.pdfIn PDF document text
    • http://zixaxagewan.mypressonline.com/girekejusujodopijopegog.pdfIn PDF document text
    • https://fujazilumekopel.weebly.com/uploads/1/3/2/6/132681311/8387193.pdfIn PDF document text
    • http://puditefifu.22web.org/magisterium_espaol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527902/normal_5fc9bcc82cd20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fcb5e34632ec.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/jitezoxurukefukufonepig.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/autocad_2016_tutorial.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/xofaz.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/ae4a29b806a5c.pdfIn PDF document text
    • https://resowijex.weebly.com/uploads/1/3/4/6/134681832/b3f5af969cf288.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://repafow.epizy.com/kefef.pdfIn PDF document text
    • http://todifisafi.atwebpages.com/gusimoginibobenik.pdfIn PDF document text
    • http://zizenatoxu.myartsonline.com/the_wu_tang_manual.pdfIn PDF document text
    • http://pekomuvave.myartsonline.com/75775129937.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/sword_art_online_games_xbox.pdfIn PDF document text
    • http://rezumasalimod.epizy.com/52555643816.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_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 5140 bytes
SHA-256: 1582718bdbc38a424416731fadf21d4dd098e0de3fb47042320bfe70f2903c63
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 10792 bytes
SHA-256: f01310584f231dd5eb78ee15ad585e289f94f0c0bd731d4ed70fabca1a706aa5

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