Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca52f59f0c92b36…

MALICIOUS

PDF

88.9 KB Created: 2021-06-11 07:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4eac7a9365d7bc0e4661b5bfbd7c4cd6 SHA-1: 6a5e80fe103308ce36cdd99d00b903dd410661c8 SHA-256: 5ca52f59f0c92b3606849821d3af98403ad69d1845afd9dc458b93f90b0cf246
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded URLs point towards a social engineering attack designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://coretry.ru/pbw?utm_term=hungry+shark+download+mod PDF link annotation
    • https://sekowuwumobof.weebly.com/uploads/1/3/5/3/135394032/1c49a9724f2071.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467306/normal_6035f2a32403a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5fddfd28e0acc.pdfIn PDF document text
    • https://josujobo.weebly.com/uploads/1/3/4/7/134713906/4591624.pdfIn PDF document text
    • https://burabusuzu.weebly.com/uploads/1/3/4/6/134649623/delegirixomawavud.pdfIn PDF document text
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/2931637.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joraxakegeg.pbworks.com/f/what_order_do_the_divergent_books_go_in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6909f6cf-f9ed-4c50-bac4-baf1f3c78af6/united_states_timeline_from_1800_to_1825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac08c7f4-4bce-4ee9-a218-ccfa1975fb09/5008298390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab518013-2ce1-4426-8b63-ca8091eca6e9/tekopimexiforikukib.pdfIn PDF document text
    • http://ritijix.pbworks.com/w/file/fetch/144963513/julewasususevava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ac6f37-a92a-4542-bbef-43656e5fc133/how_do_you_say_beautiful_sunset_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c379e70d-e490-4106-aaef-263a0542923c/11781446019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b890abf7-1d74-4c1c-b016-b226820e7f13/what_is_political_satire_in_animal_farm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d78d6d45-c9c4-4afa-9798-2c65804d734c/bosapanabagozudalexoli.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/63966792853.pdfIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144458115/movavi_video_suite_18_crack__activation_key_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/258c2726-4b09-482c-b4ee-441c3e7abd1b/shadows_of_self.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d80237e-b894-4bf8-bb79-e458fecd6a56/why_would_a_teacher_be_placed_on_administrative_leave.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 5456 bytes
SHA-256: eaf6dff0ec187ddc1e71004e33a55b369333ee77ed448edc8c5487282646a516
font_01_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 4712 bytes
SHA-256: 21872f4dfaae29073b198ef51188afa1918c0160cf92103e176c447f5dbe509d
font_02_sfnt_off000114f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F7 10548 bytes
SHA-256: 43a5cb7909797c5200a85b57dbc9f554dfaa62a3a48c5239a18429a126cfc12a
font_03_sfnt_off00013927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13927 16116 bytes
SHA-256: afbdbd02dec82d9be1e07df9ab92004d6e2996c86bdcb9c83a2c1f8ac0d08daa
font_04_sfnt_off00014df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF0 1748 bytes
SHA-256: f0a88f0ebc5209daefb10e1ce02cecb9ab784a7a91854bfb646a3c59a620ceda

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