Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c5889928725268…

MALICIOUS

PDF

100.9 KB Created: 2021-04-06 04:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c036c706bfc13b13584e1f61b3407317 SHA-1: 18effd67f89cef924f76ef0378d9052a88c79551 SHA-256: 20c5889928725268660f13af702a3cf0b017f4e67076d1e79e5c2822357ca040
176 Risk Score

Malware Insights

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

The PDF contains a malformed exploit stream and a large number of external links, indicating it is likely part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=tamil+yogi+movies+telugu PDF link annotation
    • https://patijunig.weebly.com/uploads/1/3/0/9/130969449/ruxagoxoxu-jasoxaz-pimopoj.pdfIn PDF document text
    • https://mifugitosa.weebly.com/uploads/1/3/4/6/134631290/f65b503.pdfIn PDF document text
    • https://bugigubagide.weebly.com/uploads/1/3/4/5/134586777/guvutu-pumiwumi-rewosuxilibig-gobudepatamijad.pdfIn PDF document text
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/gotigadopijabu_kepajod_pivuremabepotu_lirokituj.pdfIn PDF document text
    • https://bopuxokefira.weebly.com/uploads/1/3/5/3/135300507/pebis-derosagemuzibu-judomowepaba.pdfIn PDF document text
    • https://gusagipo.weebly.com/uploads/1/3/4/0/134017144/90839c3bb4.pdfIn PDF document text
    • https://vixezikuf.weebly.com/uploads/1/3/1/3/131383943/tawukotof-beluxasufipoz-lepowe-vonubuz.pdfIn PDF document text
    • https://lumidenozure.weebly.com/uploads/1/3/5/3/135345408/3f95ab3f71.pdfIn PDF document text
    • https://dafizigupiteg.weebly.com/uploads/1/3/4/4/134492389/saviwupovak.pdfIn PDF document text
    • https://gatimosuxanad.weebly.com/uploads/1/3/2/8/132814295/2526461.pdfIn PDF document text
    • https://mimewizade.weebly.com/uploads/1/3/4/6/134678746/3064364.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/vewakob-kosejikalava.pdfIn PDF document text
    • https://zurareren.weebly.com/uploads/1/3/4/5/134583426/9bbccef34f98951.pdfIn PDF document text
    • https://jubekese.weebly.com/uploads/1/3/1/6/131606730/588b9784.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7abdf3-89c8-4b66-96ba-2252a3ea8804/zepusigibarinujaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3ab0cf-2eb6-470b-b87e-cc45885f49b4/cuisinart_soft_serve_ice_cream_maker_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/rcbs_cast_bullet_load_data.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/minecraft_card_game_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/is_disneyland_california_open_in_december.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b821f059-64a1-4435-8794-831b7ead10d0/dolumoren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ac67da-8d57-40fa-bd5d-0e9932c83918/what_intermolecular_forces_are_present_in_70_30_water_dioxane.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/64641224376.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/vonuzijokagit.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/sekejibetiwupanegixur.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/hope_you_are_doing_well_answer.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001114c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 5020 bytes
SHA-256: cf9798eb39d25116525e19356429b58a8041e781065cd0bbbf2b2dfeaaf4b5b3
font_01_sfnt_off0001225f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225F 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off00012db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB9 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_03_sfnt_off0001375a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375A 10256 bytes
SHA-256: ac0db038bddb6e3b919a6c34cb2b55d50e85de8b6a663c7fe207f8899129373f
font_04_sfnt_off00015a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7F 13536 bytes
SHA-256: 2a3eb1b7aba3cf9dbe20aed932e5a042e50e3ed918c74e7bd18f8a1c15001046

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