Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7216216f52bf45…

MALICIOUS

PDF

77.3 KB Created: 2021-04-04 06:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 167c582a8bc5575fed622f34b17a1a25 SHA-1: 124563362db3ce0eefab5e8a03aa81642d236b03 SHA-256: ca7216216f52bf45d5b7802cada928a932fc9cfde23b405a8f6f7fbc44b9d0f4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier flagging it as phishing and a trojan. It functions as a link farm, containing numerous external URIs that redirect to various websites, one of which is associated with phishing. The PDF's structure and content suggest it's designed to lure users into clicking these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://zajinet.ru/wix?keyword=ge+nautilus+portable+dishwasher+parts PDF link annotation
    • https://cdn.sqhk.co/tuparesoxaj/hhjaPge/mitosis_in_an_onion_root_tip_answers.pdfIn PDF document text
    • https://jawonuvanez.weebly.com/uploads/1/3/6/0/136021807/ccce9579d6b4f71.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/iis78Et/rigax.pdfIn PDF document text
    • http://auto-agents.space/high_school_biology_textbook_miller_and_levineoejlh.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/gdgdgij/92950450793.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/fC8hchg/fruit_king_produce_inc._corpus_christi_tx.pdfIn PDF document text
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/2128121.pdfIn PDF document text
    • https://fetevemukimagon.weebly.com/uploads/1/3/4/8/134896640/8cdb021.pdfIn PDF document text
    • https://cdn.sqhk.co/daviluzabidi/HvVihgh/lolapizatapudomadufa.pdfIn PDF document text
    • http://padlamadla.site/398014286661d09o.pdfIn PDF document text
    • https://cdn.sqhk.co/fofanibiv/kakSidQ/funny_wish_app_memes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_0d34e633dd154f39957fe4815d2cee6e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lusabifef/2275052377.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/rukedolukanusedano.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/live_channels_android_tv_app.pdfIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_ecd1d3dad39d4bd780d6c6f938f3bba4.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_cc20ed3c73934f338310319af7e355e7.pdf?index=trueIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_8fd5abb6062e48c581165e43f6788d68.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/modelo_disconformidad_alta_mdica_inss.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_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 5308 bytes
SHA-256: b8901290098d94e2677cf177a939b79862b3c255e39318b416fa8dfbf2fd4c17
font_01_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 10432 bytes
SHA-256: 8c9f68550a7b7d22cad29b30a89eb33f5fca32d52092100185b94a5ec14b132d

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