Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64e3f8ad3588bca…

MALICIOUS

PDF

79.1 KB Created: 2021-04-05 13:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 29e8a4b56cdc0a456c575c7c7960e5a9 SHA-1: 473e85e83ab6566e208db3945222faa5e306e0bd SHA-256: e64e3f8ad3588bca5ae8227faa563cf0ccbea85753305cc9c5171a0a81e88044
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 0.9997

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/award?keyword=no+admittance+authorised+personnel+only+sign+pdf PDF link annotation
    • https://cdn.sqhk.co/votiwixuduzo/gghbjhp/robot_warrior_shooting_attack_missions.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwasusul/ic02hia/19807605371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401982/normal_6003d13252875.pdfIn PDF document text
    • https://nabaladeso.weebly.com/uploads/1/3/1/4/131438379/kifol_nipupexe.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Dvidgjl/android_nougat_32_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/fixakozumad/0jeheSR/ashampoo_burning_studio_18_full.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412584/normal_5ffb15f7ea397.pdfIn PDF document text
    • https://mizavujubamu.weebly.com/uploads/1/3/0/7/130775062/wutil_mamoz_suzel_geguponatozes.pdfIn PDF document text
    • https://dejatenuti.weebly.com/uploads/1/3/5/3/135348415/romalukosajeza_boguz_kafupuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449774/normal_5fecb797be851.pdfIn PDF document text
    • https://cdn.sqhk.co/xojoreve/caGdege/31698551074.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/dijigibuzew.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/399780fc-83d2-45ae-a9c1-37ba16ff4da8/pupegowipevus.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_373578d7f9d847b0a3296525279d0623.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f51c401b-a5dc-4471-bea7-18807d15d4ce/mugizapetotuwunogobovopor.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_567e0ca9b6254d308ff0445d014adff1.pdf?index=trueIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_8489572fa182408aad13c044247039f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ffad7c-30c6-4ad8-894e-2f0a04f508fd/penibufesujef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d52165-23fa-4ab5-a4e6-eeec3b3aa086/pokemon_sun_and_moon_episode_1_in_hindi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7eb18b-fdaf-4f7f-950d-db11513dd576/dotokef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22693a5-21f1-44f9-bf57-3a3f9e87177d/hay_poder_en_el_nombre_de_jesus_en_la_biblia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c9c8b93-fffb-4a78-8e08-f085a7719afb/fundamentals_of_english_grammar_5th_edition.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_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 5640 bytes
SHA-256: 70cbce1ccb1629d0001b3bd458fcbcb0e6e2189e85733b436705134abc9dcd2e
font_01_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 11300 bytes
SHA-256: 1e7583a486dcce1ffe96e337e6d4b3c0cc46c4fbeb08a75c4ce1b34484f7433d