Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4f087ce9960a6c…

MALICIOUS

PDF

76.8 KB Created: 2021-04-06 08:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dba5ff652ec093b1362f13a8ab9f355d SHA-1: bcf2d4f5a7a46434b4d51a7fd3b57459501bbaeb SHA-256: 5b4f087ce9960a6c89b3927e1a0fb7961803b2a38cbef47e8fd406a18ab8defa
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=elements+of+literature+third+course+pdf
    • https://static.s123-cdn-static.com/uploads/4463009/normal_5ff79680a4edd.pdf
    • https://cdn.sqhk.co/xinulezebi/XFojfTo/cruise_ships_still_at_sea_san_diego.pdf
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/fifodu.pdf
    • https://cdn.sqhk.co/mepapogivoma/cJSghgi/draughts_or_checkers_as_the_american_call_it.pdf
    • https://tobedetileva.weebly.com/uploads/1/3/5/3/135337372/sokuvipivakit.pdf
    • https://cdn.sqhk.co/fofateze/K50khgO/translate_b_inggris_ke_ind.pdf
    • http://dowator.22web.org/35587668299.pdf
    • https://cdn-cms.f-static.net/uploads/4373779/normal_60302ebd4dd02.pdf
    • http://tugokutuli.scienceontheweb.net/aap_hypertension_guidelines_2020.pdf
    • https://cdn.sqhk.co/kelanadu/hHjapgd/cute_funny_gifts_for_girlfriend.pdf
    • http://melowimaz.getenjoyment.net/el_escudero_de_dios_descargar.pdf
    • https://tubufuximenijo.weebly.com/uploads/1/3/5/3/135304690/31c64d141463.pdf
    • http://nevinidonet.mywebcommunity.org/my_family_and_other_animals_movie_2005.pdf
    • https://cdn.sqhk.co/xubodijixali/VibjaUK/pavijarasagutare.pdf
    • http://mixutadumekaje.mypressonline.com/guwetipupul.pdf
    • http://fulukegoror.getenjoyment.net/cambridge_primary_english_stage_6_activity_book.pdf
    • https://cdn-cms.f-static.net/uploads/4474723/normal_603d59631f064.pdf
    • https://cdn.sqhk.co/jawuraxexije/hWPifyH/54459063442.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rufedum.rf.gd/comparative_and_superlative_adjectives_worksheet_grade_3.pdf
    • http://naxisimi.epizy.com/xuteguketedijetetomex.pdf
    • http://kapetevik.epizy.com/reportage_homopathie_france_5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e157.bin
a62e1d7225b510e5513e4b4b10309dec82e88783180f5a5cf58807f2c47f02e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 5232 bytes
font_01_sfnt_off0000f2f6.bin
0982649e0543eff10d67f1a2dc7bc44369221346497480eb63be52a07b2461c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 10720 bytes
font_02_sfnt_off00011778.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 4324 bytes

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