Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c55c95322e1f48…

MALICIOUS

PDF

81.5 KB Created: 2021-06-10 07:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9734ea6ea50f9f2b38e72c25526348d7 SHA-1: 7d0ab31107b6a6c08ca3262478d4d04abad07e8b SHA-256: d4c55c95322e1f48393e09f8fad31855144cc5ba2a4927f3a747a7580f2ab8e2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying it as a link farm on disposable hosting. The primary malicious URL, 'https://drafthe.ru/pbw?utm_term=diamond+iyena+mp3', is likely intended to lead the user to a phishing or malware download page. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/pbw?utm_term=diamond+iyena+mp3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408865/normal_601d58edf29a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5fcf42229b427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470207/normal_5fc6cf6f4901c.pdfIn PDF document text
    • https://kitawusew.weebly.com/uploads/1/3/4/2/134234725/5237602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_601b51d38dd1c.pdfIn PDF document text
    • https://fuvetozexogix.weebly.com/uploads/1/3/0/8/130874326/3534432.pdfIn PDF document text
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/1dfed934e96.pdfIn PDF document text
    • https://mefutegisudaxat.weebly.com/uploads/1/3/4/3/134350432/xiparodaze.pdfIn PDF document text
    • https://belifexemanugo.weebly.com/uploads/1/3/6/0/136051541/wekelimolabina-pedonexesab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_6052154d335de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408197/normal_6065aa2b38d91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_604375c1508e7.pdfIn PDF document text
    • https://giriwegulajujup.weebly.com/uploads/1/3/4/3/134320738/9467039.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450428/normal_60aff72c11857.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415534/normal_5fcfaf6ca8f18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xujefix.pbworks.com/w/file/fetch/144417213/mowovufubepepar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeaef145-92a2-4847-801f-7f827a01a38d/house_on_mango_street_quotes_and_page_numbers.pdfIn PDF document text
    • http://zixawedeg.pbworks.com/w/file/fetch/144644028/mazuroxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad11fb8-ef91-4c94-bbe7-5095e794d0f6/sobul.pdfIn PDF document text
    • http://wisarazed.pbworks.com/w/file/fetch/144728085/51126092400.pdfIn PDF document text
    • http://mutatalibo.pbworks.com/w/file/fetch/144605109/the_count_of_monte_cristo_abridged_audiobook_free.pdfIn PDF document text
    • http://tefimemovem.pbworks.com/f/13043057793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fa9fc23-2e4a-4941-8ca2-344ef6a143c7/ameritron_al-811_tune_up.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 5064 bytes
SHA-256: bc2fa5cb84647e6ae8766ec7079ffb83219dee1661afd564d4c4c08013605f64
font_02_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 10992 bytes
SHA-256: c66213e642485f17b6f32f02584fadbf53bbb1c84a5e0c5cb875e152cfd9de0e
font_03_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 18380 bytes
SHA-256: b631ebea133072303c4050335a41055c6b96cacc95dc629f16f16a62120fcf85

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