Malicious PDF — malware analysis report

Static analysis result for SHA-256 2767dcbc26660469…

MALICIOUS

PDF

87.6 KB Created: 2021-03-25 17:25:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 221819e63dfc380e0cfe9ac69f9b8d20 SHA-1: 64a6165de302e7f818ab74ea42efcd35943e112e SHA-256: 2767dcbc26660469b3d6bd19590ec108170f173372a1575ec1bf1a199bb9cdac
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable hosting or known malicious redirectors, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary malicious URL identified is https://crophysi.ru/wix?keyword=fast+download+manager+apk+mod, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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=fast+download+manager+apk+mod In PDF document text
    • http://jisuvakuwiraza.medianewsonline.com/88150805974.pdfIn PDF document text
    • http://ctyr.ru/42220076576y6s9r.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/hh92jcL/fear_the_walking_dead_season_3_episodes_list.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/what_are_the_5_types_of_claims.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/f8mBjgh/animal_kingdom_map_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/n4gdicC/snail_battles_game_download.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/38270002631.pdfIn PDF document text
    • http://tibijosetinaj.getenjoyment.net/the_motivated_student_unlocking_the_enthusiasm_for_learning.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/llUn0ib/gajulivovudijofimilolik.pdfIn PDF document text
    • http://guitar.su/impulse_response_in_simulinkzp2u5.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/cPhbii7/quickbooks_online_square_fees.pdfIn PDF document text
    • http://netzamka.ru/vivotejazabilowugo2bu1t.pdfIn PDF document text
    • http://revodegasiger.sportsontheweb.net/43250858108.pdfIn PDF document text
    • http://bigswinner.space/gevirutotejuvidisuvokamudrom37.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/samsung_blu_ray_bd-j5700_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/BI0MIia/photo_collage_frame_grid_layout_photo_editor.pdfIn PDF document text
    • http://reduslim-officialsite.site/59373997983lo1vb.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/hdhduNX/piano_tiles_2_despacito_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_349839e4b14740349064acada8973569.pdf?index=trueIn PDF document text
    • http://nubibubimalepik.atwebpages.com/75169732600.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_6d7d2594f60145e399fe2fd1bc80e2f0.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_ba24a56876484bc0bf7d1e3331d5e8f3.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 5392 bytes
SHA-256: af6f9ab7ec135d203e373cbc3d1ae1440c5f6c03bff43af0cdb53ca49413a440
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 12792 bytes
SHA-256: 03d2c27796fc71562e6346189bdc6d6e32b07ab208091254f0e19b84de826740
font_03_sfnt_off0001399d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399D 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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