Malicious PDF — malware analysis report

Static analysis result for SHA-256 d470e7187677686d…

MALICIOUS

PDF

139.0 KB Created: 2021-01-26 16:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 98e1ad1dbdecca8dd59932009c103db4 SHA-1: a4bc2b2d56f9f81d5180d85c2c6a40a144befc3d SHA-256: d470e7187677686d7558fe45a94f7a28c0a28f0898960e3136e752a7942c9f13
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to obscure the true destination. 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 embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://trafffe.ru/aws?utm_term=auto+call+recorder+app++java PDF link annotation
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/pilavufoxuza.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/jeheUgj/try_free_fire_online.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/5zie8bj/electrical_architectural_symbols.pdfIn PDF document text
    • https://cdn.sqhk.co/tedogegez/jdFxhfE/24257041663.pdfIn PDF document text
    • http://amaryllis.space/v4_mmo_classesrinil.pdfIn PDF document text
    • https://lukazerud.weebly.com/uploads/1/3/4/3/134343231/kevesewuladexew-zipatevigon-texodutun.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/dFLDric/78589338689.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/ha8mif7/wizarding_world_of_harry_potter_great_britain.pdfIn PDF document text
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/nupip.pdfIn PDF document text
    • https://cdn.sqhk.co/doboketuzoj/VjgCcX6/fr_legends_decal_code_rx7.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/yjchjrz/sim_toolkit_application_not_installed.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/gf9ojco/soccer_superstars_gamevil_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xafinoligu.epizy.com/jagepijebowevogupe.pdfIn PDF document text
    • http://kepipejesa.epizy.com/bacterial_concrete_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/jaliluzilu.pdfIn PDF document text
    • http://jibipadesubamom.epizy.com/simple_education_website_templates_free.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8E1 6568 bytes
SHA-256: 2ba6e0c4516ae528974428ab90d2fcb845e31fc6427c3681d976df34e50bf0fe
font_01_sfnt_off0001c92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C92E 5016 bytes
SHA-256: e909eeb37842565100988861fc8492f393e35d96c5f5a26602e9164e51e2e534
font_02_sfnt_off0001da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA4F 1804 bytes
SHA-256: f101fc3023143cbc24e87e2583c027b8b5ab7dfb9504abb66ff99af634bcdac9
font_03_sfnt_off0001e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E32A 10724 bytes
SHA-256: cdfcfa9182462fb88c135d144afa794fd51af379cc6923ac28d06dad0750694d
font_04_sfnt_off000207d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207D6 16236 bytes
SHA-256: c1e6f7f70e6d37080197135b4b7ca5849484af0fc4ee874c13f106fc96f23b62