Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a28e02f8de53de…

MALICIOUS

PDF

89.9 KB Created: 2021-03-22 19:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f578dfbb983a8dda17645ab20f5e4938 SHA-1: 27cb305e4a68e956e880f3c41e9854cd0f51a844 SHA-256: 91a28e02f8de53dee6bfd72fcf36fe2ff4e390ccedcda49c0b74318a29d6c999
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URL and the heuristic firings indicate an attempt to redirect users to potentially malicious or deceptive websites. While no scripts were explicitly extracted, the nature of the link farm and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=common+veterinary+diseases+pdf PDF link annotation
    • https://dojobojijiwum.weebly.com/uploads/1/3/2/6/132681334/9700634.pdfIn PDF document text
    • https://pagajunudew.weebly.com/uploads/1/3/5/9/135992687/7342009.pdfIn PDF document text
    • http://lopixerirerenex.mywebcommunity.org/2020_calendar_south_australia.pdfIn PDF document text
    • https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/rimizilu.pdfIn PDF document text
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/matepepapox_finulobov_gopizujutax_duximaj.pdfIn PDF document text
    • https://vuxupiwiruxip.weebly.com/uploads/1/3/0/9/130969000/b35880520799f3.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/quiroga_el_almohadon_de_plumas.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/434d6ada-25b9-4b12-8d0e-013ae73e5e9b/1430104524.pdfIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_88b518b51b8249b5846696c818d3518f.pdf?index=trueIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_265c91530d4a42b3942466ba0e0c7887.pdf?index=trueIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_bb857355fec74afc8eb06e4dbae3b98c.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_b2ad2893824540cf9d4eafebd46efac7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10b48b8e-885d-42c8-8aa5-dd1a62dc304f/walexubakugaxuvasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b3aa63f-7916-40f4-ae5b-5dcddfdcdfd3/karcher_pressure_washer_repair_centre_near_me.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_4e4d9ac9a9ca42cfbc482e2be7d689cb.pdf?index=trueIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_596842cb70e74632b3f4ecaed44fd883.pdf?index=trueIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_1290037b55f843a68a2da9a069c0379d.pdf?index=trueIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_fab51b575f9f4d379a4933b9ea799d6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a3c34f-683c-4fc6-95b9-a6ccad10d90b/how_to_pair_soundpeats_q12_with_iphone.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_07a6915bcf2d4246909f79f44dd7d8ce.pdf?index=trueIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_190f32fa5a6f4b5a98427ee6e34b3821.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_off000114cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 5128 bytes
SHA-256: 67e25b0d985b7c7d84b8d26fbe8ae5b984650d7cb375b78d24ffd8042d342f51
font_01_sfnt_off00012638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12638 11004 bytes
SHA-256: ef937d200ec028eb8f1712480b48002946d261d81b9fc7c8b9ba079dd03080d1
font_02_sfnt_off00014bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF4 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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