Malicious PDF — malware analysis report

Static analysis result for SHA-256 1555e57bbcd679c6…

MALICIOUS

PDF

77.3 KB Created: 2021-03-12 11:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18fd08baccb3bc7e33d0eaaa4ca1b9a4 SHA-1: a33f0ff6d767b1890b9b276c89636b91073480d7 SHA-256: 1555e57bbcd679c68494fdbf766ea34dbcf8621576c5e5a4f9c73e654dd0c590
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing a large number of external links, many of which are disguised as training manuals or other seemingly legitimate documents. The presence of a PDF_SEO_LINK_FARM heuristic firing and numerous unknown-reputation URLs suggests a malicious intent to direct users to potentially harmful content or phishing sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=intacct+training+manual+pdf
    • https://cdn.sqhk.co/gefizorabubi/ghdtoyS/60010125855.pdf
    • https://cdn.sqhk.co/govazilose/jb7IVBO/calculus_with_applications_11th_edition_free.pdf
    • https://cdn.sqhk.co/zovaratigu/NzicNgf/91068774673.pdf
    • http://fiwisud.getenjoyment.net/6.5_creedmoor_load_data_varget.pdf
    • https://static.s123-cdn-static.com/uploads/4454040/normal_5fed16bb19c5e.pdf
    • http://dexuposi.sportsontheweb.net/8654007663.pdf
    • https://static.s123-cdn-static.com/uploads/4445116/normal_5fe55404a0477.pdf
    • https://cdn.sqhk.co/parabeset/fiaF59c/paris_texas_gun_store.pdf
    • https://cdn-cms.f-static.net/uploads/4467561/normal_601a4320bb475.pdf
    • https://cdn.sqhk.co/nagebagem/ajcZjha/17416278442.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_db0cca972e75402f91e6ca86b818f9ca.pdf?index=true
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_be65c4f03d154d4daae753ac19d1eb0c.pdf?index=true
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_a8ae5ba2d9424657a1cf64aeb0fb3017.pdf?index=true
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_36f642d8259c4c809467d65c2108540b.pdf?index=true
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_dc9b21dc4cb846c6aa15c525af6ce2e7.pdf?index=true
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_efac704ad28f42b9a11fe228ef440a15.pdf?index=true
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_eaa86fac642e4180aeff0f51b7f26cb7.pdf?index=true
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_4afed669974448d3afeeaba40c33646a.pdf?index=true
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_283b209c6b19451c813a4fdde44d494b.pdf?index=true
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_0267459112d84c60858880192be3c6aa.pdf?index=true
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_aadc2b47c90a4a15a7bccfc5c5494aa1.pdf?index=true
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_6a3c3ffac12f43e48c13bf0ac615ff3f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e615.bin
0a57ed3946438e6733a41892168f193fcc4bcf02a8cfab826672397ed218058c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 4888 bytes
font_01_sfnt_off0000f68b.bin
5b54e1047ef51fabd2c6130b7625c6ee4d80b288e0ff2085b7498e480dda7062		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 10308 bytes
font_02_sfnt_off000119d2.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119D2 4324 bytes

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