Malicious PDF — malware analysis report

Static analysis result for SHA-256 5165551c4e6df1c6…

MALICIOUS

PDF

78.2 KB Created: 2021-05-01 09:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 07c4bb7b5a3f8e316fd0e87e4e9e3623 SHA-1: d8121a6f94ec619a933ee9cba5caaa8f271cae57 SHA-256: 5165551c4e6df1c6f035bca30d67d6dba03d7010a7bc93c8cbb86608da5fb171
186 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/strik?utm_term=how+to+install+lg+sound+bar+slm4r PDF link annotation
    • http://lodomujimujug.mywebcommunity.org/morphology_and_anatomy_of_earthworm_class_11.pdfIn PDF document text
    • https://cdn.sqhk.co/kojanakif/gcrohc6/kusuzojito.pdfIn PDF document text
    • https://wuxebejodivo.weebly.com/uploads/1/3/6/0/136030931/kubuxoze.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/jbjeZjj/1483400893.pdfIn PDF document text
    • https://cdn.sqhk.co/govonesed/jghgjbo/78372930259.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/zggjjjq/sowitaxivaximubowaz.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/ijghcha/7120255443.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/ghfjfhd/lozujixafozegabevukudu.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/factoring_polynomials_worksheet_kuta.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/icJhUic/93232550605.pdfIn PDF document text
    • https://videxopejevis.weebly.com/uploads/1/3/5/3/135333638/zojufalaj_vufar_lejuwepefot.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/UJiezie/2_player_ps4_games_no_split_screen.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/sarapefomagedo.pdfIn PDF document text
    • https://cdn.sqhk.co/zexatexa/TxgjakZ/46658453448.pdfIn PDF document text
    • http://gexulogoben.sportsontheweb.net/business_plan_for_insurance_brokerage_firm.pdfIn PDF document text
    • https://cdn.sqhk.co/gizulakofo/uigiidV/cgaffinetransform_rotate_anchor.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/heQibw6/mejovodaxawukizod.pdfIn PDF document text
    • https://cdn.sqhk.co/demexadol/jJ9ggic/87914296851.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/kusuzibolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e62008cb-e888-4c97-94a2-5c8eeb6ead9d/unix_shell_scripting_basic_commands.pdfIn PDF document text
    • http://raxegujanamefas.atwebpages.com/descriptive_writing_examples_ks2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e91e02e-af92-40ac-ba0f-3ebfc68065df/69964977764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001e3c81-776f-4a94-90da-ac32256f0f8f/kukoviposedibexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24ab4c2-190f-4e1e-a051-ddc88480690a/actiontec_c2000a_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05af78a4-ffbb-4882-a204-69cf5e60eb1e/rebilemiredanix.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_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 5428 bytes
SHA-256: 532018f9965bd5846b7d24dbd7da763414ddc1bad0318ccc7ff275ef7ecb6d0c
font_01_sfnt_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 10612 bytes
SHA-256: cdb629a190c9149e4550f3bcfc4df91cd62b6e6cf736baf43a2531f6a35912a4