Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c45da0d273ba8d…

MALICIOUS

PDF

77.3 KB Created: 2021-04-19 05:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 249927f2debebe539e14048ee439d5b9 SHA-1: 0811abf6a25926dc3bbada4d02e5dd41cee434d5 SHA-256: 59c45da0d273ba8dfccf2811c4f7d3cda15b8deb885a4c3b5c8bfc9ae025435a
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=how+to+cure+scoliosis+with+exercise PDF link annotation
    • https://cdn.sqhk.co/ragebobeb/jN6w9Xf/little_boy_hair_styles_braids.pdfIn PDF document text
    • http://repochka.site/cdl_general_knowledge_practice_test_ny_spanish0ckmm.pdfIn PDF document text
    • https://xizimojagetotom.weebly.com/uploads/1/3/3/9/133997363/6135198.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/9c6654700e.pdfIn PDF document text
    • http://usacreditscore.info/what_size_screws_for_element_tv_wall_mount6tru6.pdfIn PDF document text
    • http://dsv-trening.ru/116592820hu3td.pdfIn PDF document text
    • http://silkhfig.bid/napodavafg4w2s.pdfIn PDF document text
    • http://kirunag.66ghz.com/67932723857.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/bEiiaQC/blocky_cars_online_mod.pdfIn PDF document text
    • http://sefajoga.iblogger.org/46240702361.pdfIn PDF document text
    • http://dom-bita.org/craftsman_19.2v_battery_charger_manualut0hy.pdfIn PDF document text
    • https://dikijezirepa.weebly.com/uploads/1/3/2/8/132815872/vezafuwo_rufud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bf032be1-8e78-45b0-98c9-f9a83ef76dfa/jeanne_ross_enterprise_architecture_as_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea52e77-1791-45d3-86ce-b91cdd03b9dd/walmart_grocery_ads_omaha.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/android_auto_en_en_installeren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b55122-21cc-46c7-b975-ae6c303103cd/how_to_garden_in_south_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/scottish_sun_sports_reporters.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/13204711877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdca0f24-e2ed-4446-a45d-2944134f88f5/how_to_activate_acrobat_pro_dc_offline.pdfIn PDF document text
    • http://tefuguwo.epizy.com/property_sale_agreement_format_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f5f549-aa25-44e2-bd43-50f4235af178/40283847926.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 4572 bytes
SHA-256: 7f12af3a8f9332193b408b4b1a7ae15c54f2b5402cc434fccc24e86b15aadde0
font_01_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 10304 bytes
SHA-256: 97cd5108d7cb3d815cf4f9582989c93ac0fe49b2ee9ef16f8cf2c7e0ce8328b1
font_02_sfnt_off00011999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11999 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333