Malicious PDF — malware analysis report

Static analysis result for SHA-256 160b836aaf931559…

MALICIOUS

PDF

85.1 KB Created: 2021-05-18 04:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3d4f7b3b3aeb96b8238a66f339fb1b7 SHA-1: 27a17dc4682da711695dddfb877dee7b8edee1bd SHA-256: 160b836aaf931559562feb756bacf3afa759b1465964bc204d5ee69e2b93b9f4
156 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 generated to appear as SEO-optimized content, indicating a link farm or phishing attempt. The primary URL, 'https://pelibifir.ru/strik?utm_term=why+is+my+ice+maker+not+working+on+my+samsung+fridge', suggests a lure related to a common household appliance issue to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=why+is+my+ice+maker+not+working+on+my+samsung+fridge
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/da706c48f.pdf
    • https://ninozaji.weebly.com/uploads/1/3/4/6/134690112/fijomizado.pdf
    • https://mubikopupisuf.weebly.com/uploads/1/3/4/7/134711770/95caf9a3c0db.pdf
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/145f97585507.pdf
    • http://gafisisaru.22web.org/51709078691.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vonodese.epizy.com/absorption_costing_method.pdf
    • http://doguzikeva.epizy.com/penubezotanolu.pdf
    • https://uploads.strikinglycdn.com/files/892de762-8296-4ac2-b258-cf2858ab1576/yeti_microphone_stand_adapter.pdf
    • https://uploads.strikinglycdn.com/files/d98d5dac-e6f4-4673-bcf6-a8bcf883ae19/can_a_chromebook_run_minecraft_java.pdf
    • http://zuzidonul.epizy.com/75638997168.pdf
    • https://uploads.strikinglycdn.com/files/f394144b-9d85-4a88-a013-a60cc418cbcb/the_game_awards_2019_fortnite.pdf
    • http://buwepuxaj.epizy.com/bacteria_vs_virus_worksheet.pdf
    • http://tuwawolaninezon.epizy.com/bsc_magazine_january_2020_download.pdf
    • https://uploads.strikinglycdn.com/files/d4102a11-1879-4048-9efd-24ac5b3a3fae/kogemalijuvipuno.pdf
    • https://uploads.strikinglycdn.com/files/a298d31b-1a94-4df0-bf4e-2e0818d88fb2/fugenibuvaxivojodepitiw.pdf
    • https://uploads.strikinglycdn.com/files/147acbad-a7fa-4b41-af8a-1cdcf5fee8e2/what_is_the_cheat_to_activate_walk_through_walls.pdf
    • http://bimimikojawador.rf.gd/how_to_figure_out_how_many_atoms_are_in_a_mole.pdf
    • https://uploads.strikinglycdn.com/files/f274ac0a-25dd-4d51-b451-dc75d5fa3f4f/weposunirididoxoli.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_off00010c1c.bin
67842ffa56cbe2993a1e3c0888b0352d62e26e7a56c010e361e0b9e1885419d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 5676 bytes
font_01_sfnt_off00011f62.bin
0a5b817dd79bbbe160b4e157753f4c6959a539419c1b3364d50ae4ab044ea697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 11828 bytes

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