Malicious PDF — malware analysis report

Static analysis result for SHA-256 108c4d0bc1662471…

MALICIOUS

PDF

80.4 KB Created: 2021-03-13 19:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3fc45d743e2a06c8fbfc04bfbcc35737 SHA-1: 16d6b37707ba48f4c0b8897ca65a02390a203e32 SHA-256: 108c4d0bc16624710319c71e0d4b92fb98253b3fc692ce09b4a0ed97a0a6481a
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://xajibur.ru/wix?keyword=morrowind+beginners+guide+mods PDF link annotation
    • http://lejunuzegakikuv.mypressonline.com/50795068717.pdfIn PDF document text
    • https://cdn.sqhk.co/finepawug/tzifqmk/20085336539.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/my_cloud_ex2_ultra_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/darojopul/dfugiih/pudobuzazamibekof.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/67hhOje/vitamin_d_supplementation_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/hh4ifKC/vajavov.pdfIn PDF document text
    • http://zepawagir.iblogger.org/kenmore_trash_compactor_model_665_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/MifsyK9/69357572852.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/g1yjieW/39899076026.pdfIn PDF document text
    • https://cdn.sqhk.co/momogajopi/gcR7cgj/most_fascinating_wikipedia_articles.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/yhchaXJ/speed_motorcycles_costa_rica.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/vanoditobitutuza.pdfIn PDF document text
    • https://cdn.sqhk.co/lijedubejop/eUACI76/vilofosogodexugolexi.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/aididUA/7970182160.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezixus.myartsonline.com/ritofowexexozujibinixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dadb269c-534d-486a-b549-49a6e874713e/66925342569.pdfIn PDF document text
    • http://xovolefewawex.atwebpages.com/jafadon.pdfIn PDF document text
    • http://sewoxoxitif.rf.gd/identifying_3d_geometric_shapes_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a54fb7-9742-44ee-9042-9ee1fd5ead27/python_machine_learning_book_by_sebastian_raschka_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/bomewab.pdfIn PDF document text
    • http://nexavej.rf.gd/capitulo_5a_realidades_2_answers_page_95.pdfIn PDF document text
    • http://bobiwaj.rf.gd/losexemisenaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3306ad65-4456-45a2-819b-e88873e6e8f7/69407629869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665cadf0-ac72-409f-b3bb-c267fccb0c4e/is_the_canon_rebel_t3i_good_for_video.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/abandono_paterno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f094e203-94c8-42ce-aab6-8c60238db2f5/4067158409.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_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 5140 bytes
SHA-256: 41933a61dfb74245daf89b6364dd212f74ccb0fd201762b36a7c50fadca62b65
font_01_sfnt_off00011045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 10400 bytes
SHA-256: 66a7757a05c5055ba8e74e30ecaf721c4e59f385637105fc8284881597e66ce0