Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28d7fee5e13a7c9…

MALICIOUS

PDF

79.0 KB Created: 2021-04-09 05:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecedafbd8fd8696fe763214722a51291 SHA-1: 996be75134e4d626cf24f2151cd65b3b036cb859 SHA-256: e28d7fee5e13a7c993975d52e6598614e7e43357af6bb2a5ef16bcf91a09c849
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning model and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to a link farm on disposable hosting, suggests an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to 'Paige vanzant dancing with the stars scores' and 'wkhtmltopdf', which may be used as a lure to entice clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://golowaki.ru/strik?utm_term=paige+vanzant+dancing+with+the+stars+scores
    • http://xifelaseb.22web.org/ar_blue_clean_ar383.pdf
    • https://cdn-cms.f-static.net/uploads/4464861/normal_60222a2c43722.pdf
    • https://static.s123-cdn-static.com/uploads/4495065/normal_5ffb6ccb63842.pdf
    • https://static.s123-cdn-static.com/uploads/4393188/normal_5fd02e6a16275.pdf
    • https://cdn-cms.f-static.net/uploads/4367922/normal_601af6ad7179e.pdf
    • http://negedibomul.sportsontheweb.net/basic_english_grammar_exercises_with_answers.pdf
    • http://delinapod.mypressonline.com/addition_and_subtraction_word_problems_worksheets_for_grade_1.pdf
    • https://cdn-cms.f-static.net/uploads/4413362/normal_604aae8cccb03.pdf
    • https://static.s123-cdn-static.com/uploads/4375350/normal_5fdd7060add2f.pdf
    • https://static.s123-cdn-static.com/uploads/4380857/normal_5fe3d59539692.pdf
    • http://nejevefivi.mypressonline.com/julisalirosile.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sewujajapivix.onlinewebshop.net/microsoft_access_2020_tutorial_download.pdf
    • http://rexefobixavater.myartsonline.com/beavers_badges_and_awards_book.pdf
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_5268235985894d00b8e209e568143e82.pdf?index=true
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_2c43d10937724ac7a44bce90f4d055da.pdf?index=true
    • http://bugazepoja.onlinewebshop.net/38296618604.pdf
    • https://3eeb541e-75be-486c-a732-b1e279b2a932.filesusr.com/ugd/eaab1c_5f34aaa05ba74d21b387df82acfed540.pdf?index=true
    • http://sajatuvireguta.atwebpages.com/bifipowikozomosujuved.pdf
    • https://37b1cabf-41b6-4e27-befa-0fe7335ed416.filesusr.com/ugd/9d05b5_20ee43f4704346a0843f250b939589db.pdf?index=true
    • http://pivirujifija.epizy.com/nofojuvunapaf.pdf
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_25fa2f216f0b446daefcdd3ba7d2b1eb.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_off0000f5ca.bin
1d49f80e643251e6ab2615e7654e8bb2a2f5f2781385e63f44c639dec4ab7887		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 5372 bytes
font_01_sfnt_off0001082b.bin
212d3e3f55e652926dff1a04be1e3f72071935455a7fdfa087f2d99e9d3a84f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 11200 bytes

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