Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cb2f39f1ba63de…

MALICIOUS

PDF

82.4 KB Created: 2021-03-18 07:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 012d499fe8e97a669006b58d6ec456dc SHA-1: b5fa35a4ab42b71cfb76c5c20bc549827ba2d52a SHA-256: 65cb2f39f1ba63de9d9428cfa18d64138b2d9f861f6e4139cf04d0ea26b13b2e
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document's content, though heavily obfuscated, appears to be a lure related to PDF downloads, aiming to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=english+word+meaning+in+bengali+pdf PDF link annotation
    • http://biweekamnf.com/26376628778vmacd.pdfIn PDF document text
    • http://bloomwithdeanna.com/brawl_stars_opening_1000_mega_boxesasxcr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_603033597b05a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_5fd7ee6f52249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482638/normal_603c419990379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382782/normal_5fe8f88735214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_60368355e0ce0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_60496be990bd5.pdfIn PDF document text
    • http://natbeach.space/where_to_repair_cuckoo_clockn575j.pdfIn PDF document text
    • https://zurokexotuv.weebly.com/uploads/1/3/1/3/131384071/miwukuwupebib-fozaxaxoros.pdfIn PDF document text
    • https://juzowugaf.weebly.com/uploads/1/3/4/7/134773334/9946508.pdfIn PDF document text
    • https://fitovixuzo.weebly.com/uploads/1/3/1/3/131380078/71b2b0dc708f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8d5fc9c6-3dc7-44cb-b139-e01295717780/dixumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/388bf577-f226-4116-a5ea-75ead34216d2/30713783819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f892e91c-7247-4135-aae3-eac8fd284da4/66314928561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a96e27-93a0-469f-b64c-9f97ee4b4c44/vijon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60742a52-b79e-4ba5-a3f5-8852945a10e4/tidifisipilujoxilevib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0232d0-21c7-48d9-b4f4-7527f568e0f2/xutoguzikilelegoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25cb7a96-56f5-4b4c-898f-7f42d7c1fd33/how_do_i_change_the_code_on_my_kwikset_powerbolt_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40336fbc-36bc-4d74-a3d3-ea04d9b58e95/crazy_love_quotes_for_instagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0fed2b5-ba34-4c2c-aeb2-fe0d6cf9ecfc/john_carlton_allstate.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 5352 bytes
SHA-256: fdf8d425c00e148f62b45171bb3943df64ac43b4f155ef6b93022d4756b3b8a0
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 11288 bytes
SHA-256: a2942af65a27da3e8397668cc0d9be959d2e44ae6370c9d2d592a591d468d9aa
font_02_sfnt_off00012db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34