Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d986fad56fe5c2f…

MALICIOUS

PDF

82.6 KB Created: 2021-05-29 06:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10232d0029268f5a7c0428ce46fc5558 SHA-1: 2cfa5a762fe52ff6f5116dd9149b02ffb0aa1347 SHA-256: 5d986fad56fe5c2f447acfdba46a8e4d1dc24ac3a0fab8b38195828c392ca48c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to various domains, many of which are hosted on disposable platforms like Weebly. This behavior is characteristic of SEO link farms or phishing campaigns designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=best+screen+recording+app+for+android+2020
    • https://lizoduloto.weebly.com/uploads/1/3/4/7/134701777/ligisenakozosu_zexogaliseno_pujokiboriv.pdf
    • https://lobumemimakagom.weebly.com/uploads/1/3/3/9/133999871/3d7bddc4bb3bc32.pdf
    • https://vajawopi.weebly.com/uploads/1/3/4/5/134597817/e1a934.pdf
    • https://fafevidelaxikez.weebly.com/uploads/1/3/4/4/134481631/58950.pdf
    • https://suniponemiviku.weebly.com/uploads/1/3/1/6/131636748/5706356.pdf
    • https://cdn-cms.f-static.net/uploads/4484993/normal_604b7a896f260.pdf
    • https://cdn-cms.f-static.net/uploads/4418184/normal_602456ad3e201.pdf
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fc62d797a153.pdf
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5fcc623b3a7d2.pdf
    • https://cdn-cms.f-static.net/uploads/4488555/normal_602d89d251c48.pdf
    • https://cdn-cms.f-static.net/uploads/4480399/normal_602cdd94dab11.pdf
    • https://static.s123-cdn-static.com/uploads/4445881/normal_60001d1b14cc6.pdf
    • https://cdn-cms.f-static.net/uploads/4458145/normal_60521d383ab34.pdf
    • https://rukawaxosudeda.weebly.com/uploads/1/3/4/3/134308265/gekapik.pdf
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5fe05c4d47950.pdf
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/4583110.pdf
    • https://menusopam.weebly.com/uploads/1/3/4/5/134597334/wegabedew_xerukosimidudut_wekodeto.pdf
    • https://static.s123-cdn-static.com/uploads/4417413/normal_60048703368fd.pdf
    • https://cdn-cms.f-static.net/uploads/4450417/normal_60235ad5c7b8e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/29093a04-2099-4a52-bc76-e466f1a7faa3/joral.pdf
    • https://uploads.strikinglycdn.com/files/3e06a66c-df87-4010-87ee-65a2b7d82a61/lakshmi_ashtakam_in_telugu_free_download.pdf
    • https://uploads.strikinglycdn.com/files/3574211e-78c4-4745-b07d-e5fe8eb41591/77603708350.pdf
    • https://uploads.strikinglycdn.com/files/b0fdd776-0932-4cdf-8ee0-04d312028156/power_of_now_book_reddit.pdf
    • https://uploads.strikinglycdn.com/files/e1072f26-7334-4598-9a09-68a31139bfeb/48_bus_timetable_sunday.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f756.bin
a84e63d10651114be8c5aaf157b0f54ab8192ed7b35798c0b0f6a9ea9d86099c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 5404 bytes
font_01_sfnt_off000109be.bin
f2736b35fc7310bffaeb004226b3e4168ab5e1e0ff74917f6b96301972c2a8b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 10720 bytes
font_02_sfnt_off00012e63.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E63 4324 bytes