Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5ee6b6861884b6…

MALICIOUS

PDF

80.7 KB Created: 2021-03-31 16:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0a3ed3725b1723f49f8722e8c34190c SHA-1: b71efd439080e3c93e7c7849046504bcfc8bf8ae SHA-256: 0a5ee6b6861884b6bf32d35bdd5e1acc9cafb564c7933dea51f168ec3b0feaaa
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, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, one of which is hosted on disposable infrastructure. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/strik?utm_term=linking+words+b2+pdf
    • http://lujadexezusunam.22web.org/astm_d445-_15.pdf
    • http://fogugevup.22web.org/california_food_handlers_test_study_guide.pdf
    • http://jetitorurojufe.22web.org/lumbar_epidural_steroid_injection_patient_information.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bobupugarini.epizy.com/free_party_flyer_psd_templates.pdf
    • http://beluruke.epizy.com/2012_all_bollywood_movies_list.pdf
    • http://kopixagelaje.rf.gd/47638617425.pdf
    • https://2b075577-062e-477b-ba44-a680027dca12.filesusr.com/ugd/ee943f_718c337e36ac43b1a92a9caf54b60412.pdf?index=true
    • https://s3.amazonaws.com/wujanozo/muvizurusexetofa.pdf
    • https://s3.amazonaws.com/salosibejodod/read_vcf_file_android_programmatically.pdf
    • https://uploads.strikinglycdn.com/files/50ac9916-2e32-4510-a47b-c300cd8056c0/57476779699.pdf
    • http://piludid.epizy.com/how_many_books_are_in_the_junie_b_jones_collection.pdf
    • http://jigiwema.epizy.com/75937537107.pdf
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_e05124c1ffdf41d1b45177418b8bac3c.pdf?index=true
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_3945fd825f134f16a958af7b414ea3da.pdf?index=true
    • http://gowegonuma.epizy.com/plant_physiology_definition.pdf
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_ca547b31f7b74a5bb05a86edb189e580.pdf?index=true
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_fa0b6d46df40411abdc57f2fd30c3599.pdf?index=true
    • https://s3.amazonaws.com/wiwuxot/endless_tower_ragnarok_quest_guide.pdf
    • https://s3.amazonaws.com/dapekufoxiraku/best_free_avatar_creator_app_android.pdf
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_10bd8e924e344d2896f94f56a64df22a.pdf?index=true
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_3b1f3eee089144c497bf32300e3ffcea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/31b7a7cf-cb63-4c9c-83f1-9b86a33069c1/ferefekixorexonawuf.pdf
    • http://xubudexev.epizy.com/80457592620.pdf
    • https://a16eeaf1-ab09-4fb7-bdbc-3ebfa24c279d.filesusr.com/ugd/03042f_0cbc9b7d4b9a4763b1d4e155c6716c68.pdf?index=true
    • 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_off0000fb1b.bin
db95db7d2c38c2145c648ceeae16b10a2bcaa5b6cb9640248505ceecdb435cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 5336 bytes
font_01_sfnt_off00010d70.bin
83299e901d6fae2d43b7e67faf76b02484d445b346d50e4729e17a4f4fa1be71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 11796 bytes

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