Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69129b6e961d7d9…

MALICIOUS

PDF

72.6 KB Created: 2021-02-08 23:08:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3988a1ff59d65ae71a451b9786b3ff33 SHA-1: e3d2c88aeabcae3465df094d2e37f496151fb181 SHA-256: f69129b6e961d7d9a75db277e0927ab94d571c264fe643386e1fba77935d46e7
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://yafferge.ru/aws?utm_term=bonjour+tristesse+pdf+francais In PDF document text
    • https://wobereresexo.weebly.com/uploads/1/3/1/6/131606335/7477d436.pdfIn PDF document text
    • http://tanifulumu.iblogger.org/criminal_movie_song_webmusic.pdfIn PDF document text
    • http://pajodumu.22web.org/cycling_jersey_template_png.pdfIn PDF document text
    • https://wuginimujewege.weebly.com/uploads/1/3/4/7/134714977/pogarimo-nogolunasule-sopagifo-miludaz.pdfIn PDF document text
    • http://futubog.22web.org/97389249912.pdfIn PDF document text
    • http://zigejetulanoda.iblogger.org/omo_see_aunty_wey_mumu.pdfIn PDF document text
    • http://wowezixuxaxu.22web.org/address_book_template_word_2007.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fogesogorukob.epizy.com/google_local_guide_level_6_perks.pdfIn PDF document text
    • http://rujemivegelap.epizy.com/adding_and_subtracting_integers_maze_answer_sheet.pdfIn PDF document text
    • http://pavinudoj.epizy.com/aaaah_full_movie_at_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/bsc4success_reasoning_puzzle.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/63290834832.pdfIn PDF document text
    • http://dimazobuxijema.epizy.com/blank_kanji_practice_sheets_printable.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_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 5244 bytes
SHA-256: 9e798123a6fe4360cba1ccbf812612f2bd6ab89292b1b6eac95b0387e70ded37
font_01_sfnt_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 12000 bytes
SHA-256: c389fbb47b54bcb59310eed624dc170a91b1df0c4be5d013b0a9d2bae6e5686a

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