Malicious PDF — malware analysis report

Static analysis result for SHA-256 16539688701599a0…

MALICIOUS

PDF

78.6 KB Created: 2021-03-20 05:42:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6da5675ea262032736312fa4ccf46170 SHA-1: 3f34a6d53e93027f72847b2bb0900ed3ae3ed747 SHA-256: 16539688701599a001f3ab20159695ab59ac03db5cf604f336397c80f60cef28
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute traffic to potentially malicious sites. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, along with ClamAV detection and ML classification, strongly suggest malicious intent. The primary malicious URL identified is https://jacksth.ru/strik?utm_term=weber+grill+replacement+flavorizer+bars.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=weber+grill+replacement+flavorizer+bars PDF link annotation
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/mifunafalosi.pdfIn PDF document text
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/fibusukarazup.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/jhiiEVR/tip_calculator_for_pizza_delivery.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/hi4jhif/name_mc_girl_skins.pdfIn PDF document text
    • https://cdn.sqhk.co/komilede/j50kEhc/deadpool_2_motion_picture_soundtrack.pdfIn PDF document text
    • http://zoom-omsk.ru/5683521078g0pwr.pdfIn PDF document text
    • http://tupujetu.sportsontheweb.net/signs_and_symptoms_of_anaphylaxis.pdfIn PDF document text
    • http://joy-todays.online/convention_syntec_grille_salairescst5.pdfIn PDF document text
    • https://cdn.sqhk.co/dojarodawiw/gehbjd1/picotin_22_price.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/kazonipananuve.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/cjazYrm/gorilogoliwiboga.pdfIn PDF document text
    • https://zupevinar.weebly.com/uploads/1/3/0/7/130739631/loxulav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f2a5a6-bae3-4cd7-ad93-2788ec5a9759/staples_mailmate_shredder_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1572daf0-698b-4077-81d8-14e00b8f9c43/what_is_ontological_argument.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92bedc15-b8ad-4e1e-aa6e-f8985a422473/2682613200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59059d1f-3a48-4579-b462-1fbb69c19e79/muzosejaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d1542c-fb2a-4537-8c0c-6c86466af7be/dog_man_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00622047-f447-478b-b018-a9e81fcec651/nowofiliwatodenajagevef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db5bfef-05f2-42ac-beae-ab922b97552c/beats_solo_wireless.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcfe9740-0de6-4e55-a8d4-63f22ac0b674/john_deere_gator_parts_ebay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddc70a9b-1a3f-4540-a73d-56f1fa2ee3d7/free_site_specific_safety_plan_template_word_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa8dfd74-6732-46ac-b527-d6f8122df17d/39570605742.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_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 5600 bytes
SHA-256: e5b6c1d8662ab13c7c86dfa4cee69a375cf92a358ef3db36deeefb51a14c6140
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 10816 bytes
SHA-256: 7dd7df7bf11bd6a8cc3b7e82c9d7ab49b8f4464a478f23e00d0badb3b4a62963