Malicious PDF — malware analysis report

Static analysis result for SHA-256 799286f2c6859602…

MALICIOUS

PDF

88.1 KB Created: 2021-03-31 10:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb1548e3f016ffb01a303354611a4a6e SHA-1: d37c0e2024a1701f446532fe4073e83b454d44aa SHA-256: 799286f2c68596020f136be4c82a0b651197fc60b4601297a9f50735ed643ff2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, with one pointing to 'nipisod.ru', suggesting a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nipisod.ru/strik?utm_term=is+bbg+effective
    • http://prizinsta24.online/98798077956vwic3.pdf
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/vufeguwet.pdf
    • http://dreamingdeveloper.com/xubevotic6q4y.pdf
    • http://lazujifoxupa.getenjoyment.net/orange_inheritance_book_1.pdf
    • https://bokowamimufap.weebly.com/uploads/1/3/2/7/132712050/zinudexebo.pdf
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/duvakarifubuwanekede.pdf
    • https://mefewenitili.weebly.com/uploads/1/3/1/3/131379946/6938942.pdf
    • http://mofirixubutibi.getenjoyment.net/supplementary_and_complementary_angles_worksheet.pdf
    • http://segway-wheelchair.ru/realtek_audio_driver_windows_7_hp_pavilion_dv6000qkxvf.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://storeplus.pro/wofuwoziwudopgbaso.pdf
    • https://ralutadepijug.weebly.com/uploads/1/3/5/3/135305627/78a2b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8a0c2377-8316-45b2-88cb-e8f7ac3fcf6e/gebum.pdf
    • https://s3.amazonaws.com/safenalavojuwu/legibuwujawular.pdf
    • https://s3.amazonaws.com/zikeko/tuwaxefokuder.pdf
    • https://uploads.strikinglycdn.com/files/61eabbc7-ad92-48dd-977a-8a1c042d9ce2/bidularawar.pdf
    • https://uploads.strikinglycdn.com/files/5340053e-ac96-480f-be5d-10ff113e2f4c/60581440471.pdf
    • https://uploads.strikinglycdn.com/files/bda929e2-f60e-41f1-b5d7-08f5a2ba8013/problems_with_american_cancer_society_wigs.pdf
    • https://uploads.strikinglycdn.com/files/ec21dba6-fa69-4715-a123-d849b75ea534/how_soccer_explains_the_world_essay.pdf
    • https://uploads.strikinglycdn.com/files/5d61a35b-d22c-4a25-86d2-c15e44a09900/misugupofomidejab.pdf
    • https://s3.amazonaws.com/pokorevalaxex/how_to_adjust_seat_on_fisher_price_swing.pdf
    • https://uploads.strikinglycdn.com/files/009fc9dd-69ac-47a8-b916-d540061ce62c/microsoft_project_2007_tutorial_ppt.pdf
    • https://s3.amazonaws.com/pilazi/workpro_9000_chair_assembly_instructions.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f021.bin
5122ddace921e55e56cacd3840311d06bdab464e65e67d0473c6e1d22af7d6b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 4420 bytes
font_01_sfnt_off0000ff35.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 1800 bytes
font_02_sfnt_off000107c2.bin
a54a41a73ada67987efb635918c6c7c5e7aa24e1ce7cab51c709f45931754f5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 10892 bytes
font_03_sfnt_off00012d1a.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1A 16312 bytes
font_04_sfnt_off000142a6.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142A6 4324 bytes

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