Malicious PDF — malware analysis report

Static analysis result for SHA-256 79587a08fc76a06e…

MALICIOUS

PDF

97.7 KB Created: 2021-03-17 01:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7177743e5e5f2e952589a37648445b90 SHA-1: dcfc4364fad3f8a6bea0204308d2e58c9c522fa1 SHA-256: 79587a08fc76a06e5cd3a0596435e19926e3b0f46b39370d853f02f247d3094f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=c+l+c+ka+full+form In PDF document text
    • http://daludaja.getenjoyment.net/2nd_grade_books_to_buy.pdfIn PDF document text
    • http://eurosett.net/94373697787b8xs3.pdfIn PDF document text
    • http://dfds.in/application_programming_interface_bookgspom.pdfIn PDF document text
    • https://bizepusenovub.weebly.com/uploads/1/3/4/5/134509919/756297.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/37014517854.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/oxford_bookworms_level_1.pdfIn PDF document text
    • http://kalukoroduro.mygamesonline.org/oxford_dictionary_synonyms_and_antonyms.pdfIn PDF document text
    • http://wovuwukotuvoxi.mygamesonline.org/kendall_atkinson_numerical_analysis.pdfIn PDF document text
    • https://ritulamilogukez.weebly.com/uploads/1/3/4/8/134864073/07a8b7.pdfIn PDF document text
    • http://naturfresh.space/how_to_disable_bridge_modevhjas.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/16819803660.pdfIn PDF document text
    • https://gakezepatirana.weebly.com/uploads/1/3/2/7/132712251/6687553.pdfIn PDF document text
    • http://vinograd.io/mallela_theeramlo_sirimalle_puvvu_full_movie_watch_onlinecd6zt.pdfIn PDF document text
    • https://rujuramokukavet.weebly.com/uploads/1/3/0/7/130739146/paniwageguru-leruvejem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_9218cd21e3ac4f3cacb9f3a316d495eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57931b71-ca10-4a96-9d3d-c037c5c01cd1/pentair_variable_speed_pump_schedule.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/11739652516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca6939e-1d1c-4d8f-af37-b7e499e6763d/29338973001.pdfIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_e935555684d84a5ba5c3bb09f0d7541c.pdf?index=trueIn PDF document text
    • http://nibemodida.myartsonline.com/37114522001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95ca30e0-b470-438d-88d1-e8c04b4495e2/frases_del_principito_hacia_la_rosa.pdfIn PDF document text
    • http://bitujiduruv.myartsonline.com/octavia_butler_wild_seed.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 4820 bytes
SHA-256: c50cbabf21997fee6a071608a0726896966eebd22dfaa0b37728c2616c948346
font_01_sfnt_off00011b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B22 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off00012685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12685 12236 bytes
SHA-256: aa66aa90f2233c4a05858b83dd08fb7bc15cd9dc463bc86c8dae0bbb4bb91940
font_03_sfnt_off00014e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E73 14240 bytes
SHA-256: b9e23032a1438c794e810b08233ee634d5b7bb3de1d7ef869200806c240b09e7