Malicious PDF — malware analysis report

Static analysis result for SHA-256 b629969c48afb3dd…

MALICIOUS

PDF

78.2 KB Created: 2021-04-30 20:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9de635cc264b1bcc19ceec99b32902d1 SHA-1: 002bfb977d1fe01a87b8f57d52ff0378e739d5c0 SHA-256: b629969c48afb3ddfb8cf7d4e659ef0b37a1593013ada85f88437a2135a3bc66
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, with one prominent URL being https://fokemale.ru/strik?utm_term=asp.net+mvc+core+get+current+user. The presence of a link farm suggests an attempt to manipulate search engine results or direct users to potentially malicious content, aligning with phishing or scam tactics.

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://fokemale.ru/strik?utm_term=asp.net+mvc+core+get+current+user PDF link annotation
    • https://kepigepejabuji.weebly.com/uploads/1/3/4/3/134315220/pipidozo-regebukijuxesu-gekefo.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/anti_ragging_form_aicte.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/4089698.pdfIn PDF document text
    • http://gelufose.scienceontheweb.net/orthopedic_physical_assessment_magee_6th_edition_free_download.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/e477845088512.pdfIn PDF document text
    • https://takesefitetipal.weebly.com/uploads/1/3/2/6/132682925/piwolor.pdfIn PDF document text
    • https://zutofamofiselas.weebly.com/uploads/1/3/4/0/134040676/62bb259372a6a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_94ca9d5a3866404a9cd16e5731157835.pdf?index=trueIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_c3243bdfde2b47a282ba20775cc9bd3c.pdf?index=trueIn PDF document text
    • http://gipebevu.atwebpages.com/4th_grade_fraction_word_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7f239dd-b05a-4ec1-9a08-3adecb9ff1c5/george_foreman_grill_cooking_times_boneless_chicken_thighs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201ac3a6-2c95-4e50-b90b-df77b61c5083/13117269013.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_204974e9414f458e849532aba8053636.pdf?index=trueIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_eaf1e4d0dd4f43058f539dd54e89f861.pdf?index=trueIn PDF document text
    • https://b9b086bb-db5c-4c47-b99c-4ca3d8c772c1.filesusr.com/ugd/c090b7_e54b8ee0e6674a8280b00d02ed0e5354.pdf?index=trueIn PDF document text
    • http://jokosen.atwebpages.com/22211763661.pdfIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_8bd78b2ee7d845dda671dfbe5cd7057f.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_e692b023f963447bb505f0ca4f450a66.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_e4d1e4ca84684358b627224c2c07e75c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97403206-4420-4bb7-a611-cddc5ccde2bc/wonderwall_projector_manual.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_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 5092 bytes
SHA-256: 130cdd3616028ad95fa162840e43670caf567a8dd74b03774812901bee55ec58
font_01_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 11292 bytes
SHA-256: 4b3e2d83bd7988694507288980f5b5f932813d3807f857ddc5c4017f0a0b97c4