Malicious PDF — malware analysis report

Static analysis result for SHA-256 e535caa7b4cb859e…

MALICIOUS

PDF

77.2 KB Created: 2021-03-17 05:33:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c5834ba91050f29bdfc8f0b9bac80672 SHA-1: bb57e9b3ec6e1d86973d01a95af73f39b38e51ba SHA-256: e535caa7b4cb859e01d5f0b5ca51159180bc9ab223d690d862a35abfe087cc1d
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or hosting malicious content. The presence of multiple external URIs, including one with a 'strik' path, suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=no+signal+on+thermostat PDF link annotation
    • http://zikapipumimapo.22web.org/what_asvab_score_do_you_need_for_navy_seal.pdfIn PDF document text
    • https://werakemil.weebly.com/uploads/1/3/5/9/135973214/vapizulovowiseta.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/vovunekapajegapobal.pdfIn PDF document text
    • https://cdn.sqhk.co/raxinosi/iiIha8E/piggly_wiggly_sister_bay_store_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/gjCFMJg/80066861965.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/e66a73981350ecd.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/hjehdgQ/aol_10_free.pdfIn PDF document text
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/nalosipa.pdfIn PDF document text
    • https://cdn.sqhk.co/dipewoduge/coiilic/mitesozexamiwodi.pdfIn PDF document text
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/4043962.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/5bc96336-313e-44bc-9b4c-c39a53312d5b/the_little_prince_mp3_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/31951671157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74024ba-aef9-4fc9-adcd-75d7231b3e50/blackburn_trakstand_ultra.pdfIn PDF document text
    • http://jowimonaperu.epizy.com/2015_ap_statistics_multiple_choice_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abb9c14-7994-4d08-9de3-cdd400e1ca7e/93658853086.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/17015275549.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/58086491129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f89f95f-50bb-437d-91ef-02fb1a7292f8/is_there_a_bible_study_fellowship_app.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/buxolasokebivoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a50ecd1a-6f0a-4227-bfb4-68881395b72b/is_hp_better_than_chromebook.pdfIn PDF document text
    • http://futifuzofu.rf.gd/asphalt_7_heat_apk_data_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b447b5e9-2364-453a-b3cb-a0ca792ca022/42843514264.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/31773847041.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_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 5068 bytes
SHA-256: 542da19fdf52a8613ae5e16eca681761641b7ba03de3fae53f41258d3eebd1ab
font_01_sfnt_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 10900 bytes
SHA-256: dfc6f30a0a06545cd7b78a1360f483a1ec825deec1ba9120fe9ca294a4a28a46