Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b87a77878f273a5…

MALICIOUS

PDF

91.2 KB Created: 2021-05-07 06:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0a391a11f9a7af61cd5f79cbf2afa8bd SHA-1: 29d04fa9e4fa04d2d3ce1d94740d10ea777d9d29 SHA-256: 8b87a77878f273a59f036ad29fd68e36857e336bf78ea858af51004c3302fc37
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. The embedded URLs suggest the document is designed to redirect users to potentially harmful websites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=my+sweet+audrina+lifetime+movie+synopsis PDF link annotation
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/1581738.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/FieIhjO/flight_world_war_11.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/fSx49ig/pinabeperumokova.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/i9fhh3d/81835888181.pdfIn PDF document text
    • http://sallles.ru/tipalaxalajunubanqae.pdfIn PDF document text
    • http://chebsvet.ru/genawof45mz.pdfIn PDF document text
    • http://lady-bug.club/favilumukixymxd.pdfIn PDF document text
    • http://cocobeautybar.ca/3._how_does_glycolysis_contribute_toward_aerobic_respiration_anaerobic_respiration_and_fermentationeymbt.pdfIn PDF document text
    • https://cdn.sqhk.co/dosijowikul/igEjiie/21100280482.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/fjc7CyI/vebowiratamu.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/MZhkWhh/fitness_pointe_phone_number.pdfIn PDF document text
    • https://nogexumojadug.weebly.com/uploads/1/3/4/2/134235638/40c73109f64af.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/iDWghhd/easy_song_lyric_quiz_questions.pdfIn PDF document text
    • http://trellos.fun/metal_slug_5_character_selectekaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/fUQdDji/mativixobeneteleximu.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/3jcgdha/screen_capture_android_6._0.pdfIn PDF document text
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/4528428.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/icCticT/kegudamowaz.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/df345ac0-ffae-43ad-b6bc-796c7157ef29/4375489233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4093bac3-49b0-4253-b0a8-c2ee73d1f6d2/33089498804.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 5444 bytes
SHA-256: 506d96969b1575f3b326f82b2bda1813816411946f8f8d0c556c272bc5748cb9
font_01_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 2516 bytes
SHA-256: 62522dd98cd4591e29247594c4280ef13931d0dbccdf5fb09601a2ac7850490d
font_02_sfnt_off00012090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 11856 bytes
SHA-256: 11d27fce9f20e9c68bdce5592cd0cf515753e3ac754207676afcdbf04165d747
font_03_sfnt_off0001492f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492F 16344 bytes
SHA-256: ed45a24507f18daeaf6b6e9cac20235e9e43bed88bc2d44b7621eff085e31190