Malicious PDF — malware analysis report

Static analysis result for SHA-256 2babbe7e676304e6…

MALICIOUS

PDF

81.2 KB Created: 2021-04-27 13:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae0f4cfa8d0dfcfd88ad5c29dfd31198 SHA-1: 804db367b35408e942ca97a63247b13c17b9e8cc SHA-256: 2babbe7e676304e6705da8dac18f1b2c1e69fb646c29919f1e858e38024c010e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The document body, though heavily corrupted, contains keywords related to firmware updates, which is a common lure for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=how+to+update+firmware+garmin+vivoactive+3
    • https://jidedenevunuva.weebly.com/uploads/1/3/4/4/134498736/zokivuxapazipado.pdf
    • https://cdn.sqhk.co/fusozuwalas/ygjjeaY/5190931099.pdf
    • https://vilinumatilaji.weebly.com/uploads/1/3/2/7/132740241/b2db7ad.pdf
    • https://wajegeteb.weebly.com/uploads/1/3/4/8/134896445/xulipitar.pdf
    • https://cdn.sqhk.co/tigixexaxi/ggEjijj/hong_kong_kings_village_minersville_pa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://duzexatalug.rf.gd/lekinalemuzox.pdf
    • http://masuroti.rf.gd/coleman_presidential_2_furnace_manual.pdf
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_34b0520393c6416bb27bd6b48d62ffd6.pdf?index=true
    • https://36d3fe4d-ce77-4ecd-ae21-04b42370c250.filesusr.com/ugd/871c54_2b838a36bb204498864acbf9afc37a96.pdf?index=true
    • http://rivapikifixox.epizy.com/42997628892.pdf
    • http://sabukizazuse.epizy.com/snark_ukulele_tuner_amazon.pdf
    • https://s3.amazonaws.com/mesotodimus/75810241425.pdf
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_60719df95c7c4ba0b0fa650cffef9ed3.pdf?index=true
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_d1714a8014b44b928a756ce650783473.pdf?index=true
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_310b1475e36f467a8110e350b5492994.pdf?index=true
    • http://fubobowom.rf.gd/38647013909.pdf
    • https://s3.amazonaws.com/vutame/vevipiduna.pdf
    • https://s3.amazonaws.com/lerezazo/88594607980.pdf
    • http://sewejatoxomo.rf.gd/94929819536.pdf
    • http://nanabiwilave.epizy.com/63066142024.pdf
    • http://zamoguwudegovo.rf.gd/begixum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efdd.bin
c601431cd1d4f949369a390094cda7e5e1af90a7d3ce22552b9a665c83e0f7cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 5424 bytes
font_01_sfnt_off00010257.bin
eddad510730ecafac37a8327c037f3770ade2de37b4ca8f68c83da43ddce5138		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 11340 bytes
font_02_sfnt_off000128f7.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 4324 bytes

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