Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44e5b19c93ce1a5…

MALICIOUS

PDF

102.0 KB Created: 2021-03-13 14:27:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e3327bcb8f5e2f6107cad3a243023c29 SHA-1: efa45fff8355685d3b72e1fbe9c5d23cf92a2b4b SHA-256: f44e5b19c93ce1a52d9bb6254c53f4903335081060a67454f120425b777639f8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm. One prominent URL, 'https://xezojetit.ru/award?keyword=basic+computer+knowledge+ms+office+mcqs+pdf', is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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.
  • 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://xezojetit.ru/award?keyword=basic+computer+knowledge+ms+office+mcqs+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368758/normal_601a22d281ce1.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/geW5ejh/easy_division_worksheets_with_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/zonelatu/icHieie/64664222740.pdfIn PDF document text
    • http://netlysy.online/why_i_wrote_the_yellow_wallpaper_by_charlotte_perkins_gilmanf6u88.pdfIn PDF document text
    • http://weraka.online/68156603385a2mpt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_5fd23f32266f7.pdfIn PDF document text
    • http://drenajkrasnodar.ru/dozubononimala4ormk.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/h9aJPpR/hello_dolly_characters.pdfIn PDF document text
    • http://trikotoria.ru/26648006949ongwi.pdfIn PDF document text
    • http://fruit-citrus.space/cuantos_centimetros_cubicos_hay_en_1_metro_cubiconhuxb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/java_file_absolute_path.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/7019012847.pdfIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_2a843ba6429c4b778f591caade14b42f.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_91ca9b2c33af4afc96c47a12d4d4bfaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/somisilegex/45831851153.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/8220704334.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/funny_cat_sound_ringtone.pdfIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_e9464a85f44f45859d8e5c9aa4ab0ccb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/pekadiled.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_12b0c57e8b2f4be1a4d355422db94c48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/48068122117.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/how_much_is_a_coffee_from_dunkin_donuts.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_87737d06ed904eb4b54eec673f15cbda.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14702 5804 bytes
SHA-256: 662667e36aa400edf7acd5aa2747ce8f65fb5e7619abebd4815914550fbf652e
font_01_sfnt_off00015ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB7 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00016345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16345 11348 bytes
SHA-256: c1ad9f56600bc904a8d469e8b34f25f3d68f9b3dd9be7c70c72f6d49f34f6f70

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