Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8e15a8f70322c7…

MALICIOUS

PDF

72.9 KB Created: 2021-04-07 06:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 854920d00456c27fbdaaa8cc51ab0126 SHA-1: e2a5cc39e489078862614ca59ecf6ef3ccdf0443 SHA-256: 8f8e15a8f70322c7a47a61aff19c36ed81ae8d6cdd268e79a2471839cb9b94b2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic flagging it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://ponafet.ru/123?utm_term=ni+crio+9064+datasheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424043/normal_6039ebe4110b8.pdfIn PDF document text
    • http://azalea.store/best_online_arbitrage_sites9f6zn.pdfIn PDF document text
    • http://gomikugulud.22web.org/46286457027.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/dirisefujixafimexiju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482219/normal_5ffe52cbe4a01.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/9574343529.pdfIn PDF document text
    • http://senteber.site/8686301807328ngc.pdfIn PDF document text
    • http://winoraama.fun/stephen_kings_the_shining_1997_casty1q5j.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://gijewitog.rf.gd/an_invitation_to_arithmetic_geometry.pdfIn PDF document text
    • http://purupuladufuba.rf.gd/xutevosawesavowuxopuv.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/guided_meditation_letting_go_of_resentment.pdfIn PDF document text
    • http://manuwakagekewu.onlinewebshop.net/figoxajufexibaku.pdfIn PDF document text
    • http://zofududa.rf.gd/28171443436.pdfIn PDF document text
    • http://satosawinesuf.rf.gd/canciones_de_guitarra_para_principiantes.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/jizijodakafo.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/rimudopobogibapav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6164f8fb-893b-40fe-80d1-3b4c75cd3d82/tunupawivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26999e69-85dc-43a8-ac0d-88039dce1e5d/how_to_become_red_cross_certified_lifeguard.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/building_material_calculator_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da471db-dc70-4863-bcc2-2d3d590eac6e/how_to_turn_off_timer_notification_on_dish_wally.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a79e9714-5d03-4346-880e-e5ae2d2bde40/research_journal_of_philosophy_and_social_science.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_off0000d3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BB 5184 bytes
SHA-256: f86a478a3bc086efabeacaa8722aa15d53bd4f7dac2013ef7a44cba03f8325d1
font_01_sfnt_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 10152 bytes
SHA-256: 0a8210b50c341eb17bbc619aa94ccfdd2c05ab90dd030524cacdf531ee3a35da
font_02_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c