Malicious PDF — malware analysis report

Static analysis result for SHA-256 d915cbe53adc6323…

MALICIOUS

PDF

93.0 KB Created: 2021-05-08 17:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1800a77e119802d8934a3dc0d14f6b8f SHA-1: ae4f63f622c13e3fc71b1d5aac0881254e373270 SHA-256: d915cbe53adc632378d661cd87c6977288e8947bacdfdb203a025790bb1d9bb5
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://jacksth.ru/strik?utm_term=1.+jelaskan+definisi+human+computer+interaction+%2528interaksi+manusia+dan+komputer%2529 PDF link annotation
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/magovenepuj.pdfIn PDF document text
    • http://gudokav.sportsontheweb.net/vocabulary_for_ielts_writing_task_1_and_2.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/vwiaja7/my_first_piano_adventure_writing_book_c.pdfIn PDF document text
    • http://bionatur.space/microsoft_access_database_engine_20128kubt.pdfIn PDF document text
    • http://regse.website/295361155696g2jc.pdfIn PDF document text
    • https://meverelalopabij.weebly.com/uploads/1/3/4/1/134108836/6049f3bad058f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369315/normal_5ff9544f79f44.pdfIn PDF document text
    • https://beluloxepivizor.weebly.com/uploads/1/3/4/1/134131295/451a8e52f86d.pdfIn PDF document text
    • https://toledopo.weebly.com/uploads/1/3/4/5/134596352/ae14253d4d1fd.pdfIn PDF document text
    • https://saxisonowe.weebly.com/uploads/1/3/4/5/134508075/wadikosa.pdfIn PDF document text
    • https://cdn.sqhk.co/bebiwamulanu/aXEDnhf/aroma_file_manager_for_android_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495707/normal_60510c6b74e09.pdfIn PDF document text
    • https://cdn.sqhk.co/wenudiwome/gigichd/lasodiwabi.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/agni_siragugal_book_download.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_4b19eb6703b44789934232aba2000994.pdf?index=trueIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_9e659306b6d04cf0931f63a7088ac1af.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_a0f7689ad742406c96b5182f6d6ce50a.pdf?index=trueIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_3848067de7d448c39dc24b12becb412c.pdf?index=trueIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_c01446d811fc418d9beefb5fff5fe9ff.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 1684 bytes
SHA-256: 8b69ad8bf8706a8de8604f0485c67fb25a23b24d50174afbb8bbf061f3c53837
font_01_sfnt_off00012cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEE 5676 bytes
SHA-256: 2d4d70e4360a1ce0da11eba860bfaa689303b00d08998eb2fc6c78e79ea02a47
font_02_sfnt_off00014031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14031 10976 bytes
SHA-256: fd3531337548fc9ca1b4f12e9dfc1933fd42ae097c11b7cddb1e463358329fd7