Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50e85419b02ecca…

MALICIOUS

PDF

81.4 KB Created: 2021-03-22 00:06:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 25a3df3ae498625e04977cb2179d504f SHA-1: 225f8d6a13bf7764ba6ad30ff78faba6924480b3 SHA-256: d50e85419b02ecca0bcf760560db5be53b0cf79df24d415e2f6dacec6c9dcb7a
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to malicious redirector infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The embedded URL 'https://yafferge.ru/123?utm_term=eraser+app++for+pc' is the primary indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=eraser+app++for+pc In PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/dilazadexino_tapidibibumamen_malavef_keziwabosavabof.pdfIn PDF document text
    • http://dakixofib.22web.org/vazowemufegeputakarijabo.pdfIn PDF document text
    • http://uscreditmonitoring.info/betololuduxud1bsbb.pdfIn PDF document text
    • http://itanto.space/durosofijaguxeo8ip.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/94658276400.pdfIn PDF document text
    • http://roskycnmx.com/kobusakeseduwatudarepupk.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/c4cdbbf43995.pdfIn PDF document text
    • http://tiktokfrance.fun/is_taco_bell_the_healthiest_fast_food96e1k.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/waste_king_8000_garbage_disposal_parts.pdfIn PDF document text
    • https://papukelub.weebly.com/uploads/1/3/4/6/134666119/jedet-zuxome.pdfIn PDF document text
    • http://probmaka.tech/fargo_hdp5000_administrator_password0we0a.pdfIn PDF document text
    • https://pamesatigifimes.weebly.com/uploads/1/3/4/6/134639420/rajatixozuzemaferar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ligole/58687719474.pdfIn PDF document text
    • http://wemubivoparuf.epizy.com/brush_calligraphy_practice_sheets_printable.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/is_metabank_a_prepaid_account.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de286f7a-b082-4669-8be6-8840d3d3ddfc/cuantas_cucharadas_son_140_gramos_de_azucar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23e8ed3-16d7-4728-85b9-b9263d1d87f9/vubose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47fdf88c-52d3-4566-91d7-0f5f3a620d58/propane_line_installers_near_me.pdfIn PDF document text
    • http://toxabose.epizy.com/scott_cunningham_books_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1101c6a6-6578-475e-9d27-b0605f5712ab/65793790149.pdfIn PDF document text
    • http://ximajuranoda.rf.gd/whatsapp_video_call_for_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37635309-8772-4982-bacd-b4a87cd6e0c8/fadexesolaloturo.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/49424012459.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/jixiden.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/b._ed_admission_form_jiwaji_university_gwalior.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/81014304383.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_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 4936 bytes
SHA-256: e7f6f3d9a6984bc7f1579dafa5394e60a6faada4c3cce332cf9b73dad17dd7f1
font_01_sfnt_off0001147e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147E 10436 bytes
SHA-256: 2bd5db72d768be3032fe49e4b79b7e072cc0052c276400f64fddaed1f9798b5f