Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cb5a815942439b…

MALICIOUS

PDF

86.3 KB Created: 2021-03-18 09:47:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: cd4477206381e029beed06fa4284dec2 SHA-1: 5d76d0584e27871ed8b97f037a3192be5be81dc4 SHA-256: f2cb5a815942439b419abc4966053cff35380faba5a9aacec513ddf50163303f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs, with one specifically pointing to a URL that appears to be part of a link farm designed to redirect users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is used to drive traffic to potentially malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://druttle.ru/award?keyword=supermarket+billing+system+project+in+java+pdf PDF link annotation
    • https://cdn.sqhk.co/mogizufofuj/Eb8Ybih/smashbox_bb_cream_medium.pdfIn PDF document text
    • https://cdn.sqhk.co/vigeroti/fAp1Xhj/first_aid_kit_band_emmylou_lyrics.pdfIn PDF document text
    • http://tunulawofu.iblogger.org/nebiloronatezanit.pdfIn PDF document text
    • https://cdn.sqhk.co/bisadumiza/R2S6OSd/24003453292.pdfIn PDF document text
    • http://vasugixoba.22web.org/atom_platformio-_ide-_terminal.pdfIn PDF document text
    • http://pivogafude.22web.org/maze_runner_free_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/0ahhgcx/clash_royale_stats_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/hpqjf4g/xiragafifupe.pdfIn PDF document text
    • http://soluzixod.66ghz.com/45614638894.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafasegu.epizy.com/kotulokuwed.pdfIn PDF document text
    • http://wukerakowevomu.epizy.com/27588331820.pdfIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_9d0cec9075934ec48aeb6f67b47defa8.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_001dc4b2ff5446e3aef179498361da6f.pdf?index=trueIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_3c0366a1de3447e587398bdb46a2dc80.pdf?index=trueIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_c64b7923281c4383b811b27313cba497.pdf?index=trueIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_7f37b7b1421f437790c97fb686d24895.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_11cd8daeb7f849948cc633e3f5cf9bce.pdf?index=trueIn PDF document text
    • http://sedadij.epizy.com/50094456820.pdfIn PDF document text
    • http://mosaxigegikoza.rf.gd/json.stringify_in_c_.net_core.pdfIn PDF document text
    • http://jodunobu.rf.gd/41225093192.pdfIn PDF document text
    • https://6b551870-9d71-4c88-87ac-30bafd697196.filesusr.com/ugd/b27e13_fab8167dcc114b13936432a890202a1b.pdf?index=trueIn PDF document text
    • http://xovojiga.epizy.com/bio_data_format_form.pdfIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_32862bd7135248c4817bb1b1d197e19b.pdf?index=trueIn PDF document text
    • http://nogobixa.epizy.com/37235545147.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 3384 bytes
SHA-256: 6f34e3d801991ad396d67bba56c4cbee6b0cca5ebe6734bc1dc00e19d120a384
font_01_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 6020 bytes
SHA-256: d52697924dd0cefa8c6bbf3bf783ad3f40017cb554ef173730a637b1dd72a73f
font_02_sfnt_off00012536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12536 10952 bytes
SHA-256: af9a8149647191bdde37390ec5403258515f76c45f085fb544275417166381b8