Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b4448de33af1af…

MALICIOUS

PDF

66.3 KB Created: 2021-03-24 23:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9859a5d82252c8246142ffbefa094a9 SHA-1: 48f892efff695dc2598bc34d1b0d664b7399dbc5 SHA-256: a5b4448de33af1af66370a14356d4c60c0905925e40bc4df868da0dd59327ac9
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO spam tactic. The primary malicious URL identified is 'https://seumenha.ru/strik?utm_term=author%2527s+purpose+definition+part+of+speech'. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URIs indicates an attempt to redirect users. No scripts were extracted, but the overall structure points to a malicious document designed to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://seumenha.ru/strik?utm_term=author%2527s+purpose+definition+part+of+speech
    • http://vobafoselalulor.mypressonline.com/20448241928.pdf
    • http://nomiwiturej.getenjoyment.net/bixolon_srp_330ii.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_624966594d7a4e15a85ee6364fccb21c.pdf?index=true
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_d22a1ac12c7042ac976ee5b3074c59c9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2c549ff8-1727-4bb6-91cf-3db5dd11a694/81840826272.pdf
    • https://uploads.strikinglycdn.com/files/0023a48f-6301-47a9-8241-52833e503ec0/64161204480.pdf
    • https://uploads.strikinglycdn.com/files/7ae9faa2-eaa6-4939-a088-959e8f90efd3/adjustable_sewing_mannequin_amazon.pdf
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_145f3ce02f494f238410c33249e9dff3.pdf?index=true
    • https://s3.amazonaws.com/midaguvimabof/duzufanofanutegisebesejiw.pdf
    • https://uploads.strikinglycdn.com/files/786ab82f-ee88-4470-84a7-b22071266563/nigidatolipuruvawax.pdf
    • https://uploads.strikinglycdn.com/files/c484ee0d-ae2b-4b49-a915-0c78105edff7/latepemusa.pdf
    • https://uploads.strikinglycdn.com/files/211f2499-9269-4420-82f3-f483486bdb63/the_game_meaning_name_jason.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/ariens_sno_tek_24_oil_capacity.pdf
    • http://xoxekojut.onlinewebshop.net/shimano_di2_ultegra_adjustment.pdf
    • https://s3.amazonaws.com/vonusirukete/how_to_enable_dark_mode_in_ms_word.pdf
    • https://s3.amazonaws.com/bolovopizonuki/boss_akshay_kumar_song_video.pdf
    • https://uploads.strikinglycdn.com/files/fc8feaa2-9e2e-4c2e-aa5a-5999e84ef6f4/asus_p8z77-v_lx_specs.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c566.bin
a6f292f6084e3b511bccdb2dc1d5fb24c62ad3af1dfed82b7882fe807dc54d82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC566 5232 bytes
font_01_sfnt_off0000d737.bin
287ba627d10099c4062c9324d5b158cb5fa1a23439c3c105288ecadd2478a87c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 10896 bytes

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