Malicious PDF — malware analysis report

Static analysis result for SHA-256 36baf3833911eb64…

MALICIOUS

PDF

112.3 KB Created: 2021-03-08 09:57:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d21a0693a334306d463c1b22365420c8 SHA-1: 96ac9dd5cb7d652ff5e0588c79b7e575aac3bab9 SHA-256: 36baf3833911eb64f777c070310632207aef206a45f0dc38875655d7ab1adcf3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/wix?keyword=readers+and+writers+notebook+grade+6+answer+key PDF link annotation
    • https://rizegenaw.weebly.com/uploads/1/3/4/1/134108854/veket.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/76510356105.pdfIn PDF document text
    • http://govnosiakxws.online/kibakepironitajislifk.pdfIn PDF document text
    • https://penizamuravepu.weebly.com/uploads/1/3/5/9/135976181/6834856.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/hh2hege/57935340087.pdfIn PDF document text
    • https://wipezupogev.weebly.com/uploads/1/3/4/3/134307181/mazafizazafugufus.pdfIn PDF document text
    • http://sweetmeet.online/ewi_cables_reviewdfyem.pdfIn PDF document text
    • http://003-center.ru/top_anime_wallpaper_apk88jl0.pdfIn PDF document text
    • http://ek-arenda.ru/emulsion_polymerization_process9dpgc.pdfIn PDF document text
    • https://cdn.sqhk.co/bafuberudod/ij9icfm/iron_maiden_legacy_of_the_beast_tour_dates.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/andy_weir_the_martian_amazon.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/rozegotirokeka.pdfIn PDF document text
    • http://macsk.space/singer_futura_quartetjmu58.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/ft9a1jc/11923977726.pdfIn PDF document text
    • https://mawosamaretezij.weebly.com/uploads/1/3/4/8/134860838/depaxekejilivowomis.pdfIn PDF document text
    • http://zumufufup.sportsontheweb.net/med_math_conversions_quizlet.pdfIn PDF document text
    • https://wuzikixow.weebly.com/uploads/1/3/0/7/130775075/tekubobojule.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/rhdmhiw/nevon.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/64056e35-fb07-4c35-b176-3518b6960a06/86616301729.pdfIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_b28cdc59bbb04dff9b3ee7b53f3852a4.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_9fb9bfaec94d41558302497e5b28ed65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1599d225-7d90-4a65-8b57-437356d23489/mazagebetidud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77745bf1-a736-4e02-83b0-62bfcf5055b6/dejiwikoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5120a33f-bff2-4b05-b4fe-56494c47783c/subaru_ea190v_pressure_washer_electric_start_battery.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_off00017c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C79 5520 bytes
SHA-256: 7e1e70f38adc781edf7b61824aafa73c4ef40bbc90b9c616bdd5884e66966e11
font_01_sfnt_off00018f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F74 10412 bytes
SHA-256: cfbcd3ad0fd8d3164a16e111fda426df85bcd4816cd5e4f738c4615f7d932f37