Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2046ee19535cadc…

MALICIOUS

PDF

75.1 KB Created: 2021-02-21 07:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0b4a6a46dccb4d480e618f3e1164be86 SHA-1: 1ff6ba4f1c5e8854614dcf3d392cc6190e1d82db SHA-256: a2046ee19535cadc40ac9a43990547f55ce06408e6d2f9a5e99686beef80090b
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, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=vocabulary+workshop+level+b+unit+5+answer+key PDF link annotation
    • https://rulusekiraz.weebly.com/uploads/1/3/5/3/135322703/gogubaledimi_lifuditez_derufefomim_pejimumamisezu.pdfIn PDF document text
    • https://taxezuwijukiwum.weebly.com/uploads/1/3/1/6/131606901/6174215.pdfIn PDF document text
    • https://sifirugosiwoxam.weebly.com/uploads/1/3/1/3/131384024/132126e8571f5a.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/d4a8e4b9c1.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebapenuj/C84BigZ/five_nights_at_freddy_s.pdfIn PDF document text
    • http://fanitukasi.22web.org/belize_visa_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/dufubimaru/gIykhb9/install_meetme_application.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/gfdshjz/drive_unlimited_stereo.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/agdhhie/the_solar_system_developed_during_the.pdfIn PDF document text
    • http://kiwikinixibiko.iblogger.org/23506311413.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/9689518.pdfIn PDF document text
    • https://cdn.sqhk.co/samanugutu/2jdifBB/cross_roads_baptist_church_hartwell_ga.pdfIn PDF document text
    • http://sabewasarakabi.iblogger.org/vurarikojepejit.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://ravizovagusemav.epizy.com/90977605104.pdfIn PDF document text
    • http://vagaxalelevirot.epizy.com/android_programming_concepts.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/metaphors_in_romeo_and_juliet_act_2_scene_5.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 5452 bytes
SHA-256: be896eaa30f515fa5f8910b099c4def13c317eff0124930308c483246952f2df
font_01_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 10176 bytes
SHA-256: f6ff03047ca1524700ee04baba2887f299762d4ad7090c10096e1d0e0e35ba42
font_02_sfnt_off00011126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11126 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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