Malicious PDF — malware analysis report

Static analysis result for SHA-256 551f5a37d19511d5…

MALICIOUS

PDF

72.6 KB Created: 2021-02-20 07:05:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0494747a2ee16beab40e7b035f960745 SHA-1: fb726a528aef4f35560ba3360170dcdc22bdc6f2 SHA-256: 551f5a37d19511d5f3a58d30c66aff5765d9ec2b9fa7109b7b97a160045c5e5a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URLs pointing to other PDF files hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content, rather than direct user interaction within the document itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=penny+stock+charts+for+dummies PDF link annotation
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/gugexazu.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/jusog-foxobawodozub.pdfIn PDF document text
    • http://ru-en.xyz/9000399013402ywh.pdfIn PDF document text
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/7635809.pdfIn PDF document text
    • https://zodovamerevi.weebly.com/uploads/1/3/4/3/134316438/fajoginaruke-pakarifokizixov-luvutamaw-durivolija.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/iaifVie/tiles_hop_forever_dancing_ball_hack_apk.pdfIn PDF document text
    • https://foxidaxoluw.weebly.com/uploads/1/3/4/0/134016742/nunegilojuruwegos.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/joganagiwanilenas.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/W2UNUfV/clash_royale_clan_wars_2_update.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/46b6434.pdfIn PDF document text
    • http://uanews.website/erie_pa_game_commission_phone_numbern2n9q.pdfIn PDF document text
    • http://arm-watch1.club/867178114070lah9.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/black_and_decker_food_chopper_walmartwmzp4.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/gjjgDhj/spiritfarer_characters_explained.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/hQajeVY/yandex_translate_api.pdfIn PDF document text
    • https://fejilezujew.weebly.com/uploads/1/3/4/3/134340931/6047179.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
    • 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_off0000d17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17B 5276 bytes
SHA-256: d63d89f2ab54565f465d38b60f36a6b0f95d6101f3e1734ac9c64d95c295cb85
font_01_sfnt_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 10580 bytes
SHA-256: bf549b2fbe4c1744aefaabcc3815ae657c8f3ed5a724722cccc8ec2eb7cc9b4b
font_02_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

Open this report in the interactive analyzer, or submit your own file for analysis.