Malicious PDF — malware analysis report

Static analysis result for SHA-256 582cecdc66b4e172…

MALICIOUS

PDF

90.2 KB Created: 2021-05-17 10:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 828722ce3c99101db92348c926ac625f SHA-1: df2c88ffbca5d1ba13d530ddc437160b5c123ff1 SHA-256: 582cecdc66b4e1725028b4cbf0eecc942650b6c42ebe3c6bc1d6262babe84c56
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the document body, though heavily obfuscated, suggests a lure related to search queries. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://xezojetit.ru/strik?utm_term=ano+ang+ibig+sabihin+ng+tour+guide+sa+tagalog PDF link annotation
    • http://english-10.site/72321705225krkc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_60068ad0f0abd.pdfIn PDF document text
    • http://sowadegepixu.22web.org/abdus_salaam_chaus_english_speaking_book_in_marathi.pdfIn PDF document text
    • http://hookup668.site/mike_rose_i_just_want_to_be_averageeg837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484990/normal_601da63a92625.pdfIn PDF document text
    • http://winokuzovew.iblogger.org/friction_loss_calculation_spreadsheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468820/normal_60503d6ce31d0.pdfIn PDF document text
    • http://prechambre.xyz/how_to_print_wirelessly_hp_envy_4500q3crg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_6036e3084b731.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/sidiwumerejaf0tge0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476002/normal_5fe3fd2e0ee97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xubifupi/natumitudajozaseda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2776482-afbf-4953-986f-ea10a060abca/depefidujorutakizi.pdfIn PDF document text
    • http://giwupaw.epizy.com/talorutikume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5afffaf5-cc04-4140-a216-9da4eb12f488/bojubagoxuzuvuvava.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/6213570858.pdfIn PDF document text
    • http://penisofitomi.epizy.com/psychology_notes_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/daviss_canadian_drug_guide_for_nurses_16th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3009a8-6611-4720-aa2b-933392b2bd7a/4972481234.pdfIn PDF document text
    • http://mojefujal.rf.gd/logical_reasoning_tricks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16da6641-ca77-40cf-b6f3-64c72d9dbaa8/sidamotigiwuwelut.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/bekesitenowoki.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_off00012191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 5216 bytes
SHA-256: 4176d019a6c030fccb31bd6e054b90e891d3b2882d9c47664fae22fe70f8d002
font_01_sfnt_off00013342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13342 11904 bytes
SHA-256: 70d3c7ec6dc7007e1de2bbaa608de17a76a3eb6135c132136785a4200e3bee8f

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