Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcd36764940df22…

MALICIOUS

PDF

91.8 KB Created: 2021-03-08 23:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 27759482c401d7702ed771c7a58f23dd SHA-1: 7f5bee69c984983e4dd6c1d6005d50fb283eb3a0 SHA-256: adcd36764940df220a56e6108115fb06a1a61222bb875b089a0efd036223b95c
194 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of a phishing or redirection campaign, likely leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/award?keyword=immunization+schedule+table+2020+pdf PDF link annotation
    • https://jubiporosevuzu.weebly.com/uploads/1/3/2/6/132695682/dujekixesujevif.pdfIn PDF document text
    • http://gratoraama.website/ac_joint_exercises5au0v.pdfIn PDF document text
    • http://kimujedat.mygamesonline.org/how_to_work_to_stop_human_trafficking.pdfIn PDF document text
    • http://extrameets.fun/322525830051df49.pdfIn PDF document text
    • https://tajezutudod.weebly.com/uploads/1/3/1/3/131398094/tuzixumobupuxej_susovom_sapej_nezixagokat.pdfIn PDF document text
    • http://saniwofixapu.mygamesonline.org/shivprasad_koirala_.net_interview_questions_8th_edition_free_download.pdfIn PDF document text
    • http://silewugebed.scienceontheweb.net/fukebikopobavalamove.pdfIn PDF document text
    • http://frukt.fun/equus_peter_shaffer_read_online8cd1s.pdfIn PDF document text
    • http://good-production20.site/3823643258554y6t.pdfIn PDF document text
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/3845235.pdfIn PDF document text
    • http://zunololanuxigu.sportsontheweb.net/engineering_drawing_sectional_views.pdfIn PDF document text
    • http://closemaze.com/how_many_calories_in_a_daves_single_without_cheese6p7ll.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxevimisosideg.myartsonline.com/3399545676.pdfIn PDF document text
    • http://wutorokanotomav.onlinewebshop.net/dcs_world_f-15c_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6c5c85-c1b3-43e6-a2c7-53c80034c655/roland_spd_11_pad_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/887d07d8-1d57-4746-b3ea-82340d0b25ab/8123308924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55fd7a96-2ad1-4f2b-bf21-f60c4416b5ca/game_of_thrones_book_3_synopsis.pdfIn PDF document text
    • http://pezamax.myartsonline.com/9086215025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e019c2dd-1f96-418b-883d-a85606bcd419/what_is_the_purpose_of_the_worm_in_tequila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7089d111-9d19-4050-b955-c06b7744d4b9/58382509317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a28862-2e67-468d-96b1-69eb0f43c805/sources_of_the_making_of_the_west_volume_1_4th_edition.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_off000129d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D5 5700 bytes
SHA-256: a2dc47fd08d4e3d388f31b59d06f08ce4472cb25eef9601d49ef11c314d18416
font_01_sfnt_off00013d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1B 10784 bytes
SHA-256: a74d55f80b37107ec89cba34457385e77c61bb7f3e8640d4c6dfc9e0f2cfd347