Malicious PDF — malware analysis report

Static analysis result for SHA-256 5852a1f8c4d08e21…

MALICIOUS

PDF

81.7 KB Created: 2021-03-31 02:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8a3f4ac0efa30e62086921a5be3e0763 SHA-1: 84f5f47ea68e0048362bfc7581e18ab20fdc11f0 SHA-256: 5852a1f8c4d08e21b24283d103a0017731e1c101adf000d95dbc18286f794e24
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to an 'Aquaculture project report'. No scripts were extracted, but the presence of multiple external URIs strongly suggests the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/award?keyword=aquaculture+project+report+pdf PDF link annotation
    • http://mumijivamivaxij.medianewsonline.com/jean_cavailles.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/zcicjdy/super_stock_drag_racing_records.pdfIn PDF document text
    • http://bepelisufozasep.mywebcommunity.org/sizaxujukekaluleko.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/sensing_city.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/bjdjgja/3d_japanese_snake_tattoo_designs.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/hjgehi8/tugadig.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/debuvapo.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/aW2jcgh/nafatumab.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/Lieejaf/tiwegalid.pdfIn PDF document text
    • http://xisulekotitis.iblogger.org/minecraft_1._8_9_crafting_guide_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_c639eea3ac364829b122851190fe8926.pdf?index=trueIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_347f7fa068534f0097bccb4ada60c674.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/libro_intervencin_en_crisis_slaikeu.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_64c520e49dec47b2ba3540f5e39b438e.pdf?index=trueIn PDF document text
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_aa44c3e5896a4371b78d58a098ed6e7a.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_8b3425d1eb9b485abd7fb866a1951c27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/business_card_vector_free_psd.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_5e0150cb117a4a1bbc9875478c61474c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/murudute/how_to_file_form_mcs-150.pdfIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_eef876185d264a5d8054b09cca123234.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/fubegizamaduwogozepotewij.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_9ba840972af04f5cb4b49dd7eb56e769.pdf?index=trueIn PDF document text
    • http://duwujupis.epizy.com/lakonubogavobaparivi.pdfIn PDF document text
    • http://zenakezogutomu.onlinewebshop.net/foxpro_wildfire_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/zesebaxitagox.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 5160 bytes
SHA-256: 716d31052184f235bf128738007570e9199171ed537a62a67e6f293ab96ad48a
font_01_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 11120 bytes
SHA-256: d079fc570c8e08e62c0782942fb3303470942cac3e2eac211ab5e30044c94437

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