Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3035e105864e13…

MALICIOUS

PDF

85.1 KB Created: 2021-02-26 14:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5c98f2d16bad06d3519e5e2c0fbf8bcb SHA-1: bfa221b073981d3243fbeb3ca6c566363492ad1e SHA-256: 2a3035e105864e132d9b1f8bb4c9be0ab83102a227b2e1ea297470f98eda885f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure, likely intended to trick users into clicking on the malicious links for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=writing+chemical+formulas+from+names+worksheet In PDF document text
    • http://idealicait.website/aeronautical_engineering_colleges_in_maharashtra2rvfk.pdfIn PDF document text
    • http://kvrovk.xyz/scroll_saw_3d_patterns_freekvrao.pdfIn PDF document text
    • http://unonatur.space/present_perfect_tense_exercises_just_already_yet1lr8d.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/65834276412.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/97237279869.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/how_much_does_it_cost_to_become_an_emt_in_texas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://legumanob.rf.gd/books_of_the_bible_old_testament_funny_song.pdfIn PDF document text
    • http://gosigolixadi.rf.gd/fowuxagakisatedimeteka.pdfIn PDF document text
    • http://xojazexodiwosi.epizy.com/sum_of_arithmetic_and_geometric_sequences_worksheet.pdfIn PDF document text
    • http://rikovaniroxatox.rf.gd/wavizotezaneselefori.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/11317614675.pdfIn PDF document text
    • http://pujumek.myartsonline.com/is_breath_of_snow_and_ashes.pdfIn PDF document text
    • http://wamodaf.epizy.com/air_raid_siren_sounds_free.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/90030935156.pdfIn PDF document text
    • http://gukupexokopiwug.epizy.com/blank_white_paper.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 5464 bytes
SHA-256: a3b92d97e81dd969a7f3e47bf412f26d441f067283bf3f47ae267195f4ca8100
font_01_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 10472 bytes
SHA-256: 4b628be0bc25472c01d015b8418746dacc92a90a0d77da2829715a99540b6c2b
font_02_sfnt_off00012bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD2 17660 bytes
SHA-256: 8835cfc034413858c9bdf6b911d696f23441138005404a18aa231ca2be8a15af