Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b45fb78b223f06c…

MALICIOUS

PDF

88.6 KB Created: 2021-03-21 08:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 85daa1ae6ff2fc08ddece1a36b8d03db SHA-1: 830981de493a80ea0b7897ade6c51da9e0b54931 SHA-256: 3b45fb78b223f06cc0b07e830599b72805407718d7d4590df7bb0887cca9ac53
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://xezojetit.ru/strik?utm_term=que+hace+un+lider+para+que+su+equipo+sea+exitoso PDF link annotation
    • http://life-news.tech/never_fade_away_lyrics_pt_adamczykcyct5.pdfIn PDF document text
    • https://kilifunilazavef.weebly.com/uploads/1/3/4/4/134481566/turinalosuwo.pdfIn PDF document text
    • https://jaluvezutotujo.weebly.com/uploads/1/3/2/6/132696483/9647e1.pdfIn PDF document text
    • http://talemine.getenjoyment.net/96117422086.pdfIn PDF document text
    • http://autocredit.moscow/sizaboditupikityeyef.pdfIn PDF document text
    • https://linugezi.weebly.com/uploads/1/3/4/2/134265501/d92f11652785a0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500893/normal_5fffd66a8c057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425491/normal_603f164d7f302.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/mopumapozatejigilo.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/35450243.pdfIn PDF document text
    • https://sedawuxel.weebly.com/uploads/1/3/5/3/135326539/7430188.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/appsc_polytechnic_lecturers_previous_question_papers_for_civil_engineering.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411498/normal_5ffcf412e576f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_5fe6557647903.pdfIn PDF document text
    • http://mon-fortuneo.best/school_parent_app_for_pc_free_downloadx12oi.pdfIn PDF document text
    • http://vuroxinizona.scienceontheweb.net/wedejorowori.pdfIn PDF document text
    • https://lazofakivew.weebly.com/uploads/1/3/1/4/131406449/158c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_6009cb66b4e1a.pdfIn PDF document text
    • http://glawerry.online/14103656977b807q.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/what_is_the_average_engineering_salary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://davinawoguzag.atwebpages.com/85326304475.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_571dce335db24ade84ab30ae2bd4421b.pdf?index=trueIn PDF document text
    • https://ff5d1526-1eb9-447d-8915-67ca9933f1b4.filesusr.com/ugd/9565fd_f127fd71feda4eeb8c5edbdd2cf03904.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_70d22a0f91f34efd9a61c48d96c254df.pdf?index=trueIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_d8209261a7a64303951df81b430d3aec.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_f9d5a3fc8a2548689b798820a2bf4325.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 5416 bytes
SHA-256: ca88305887f79a2a3509bbb5ac1007c941caf7b46b0d7131e15f97c124547603
font_02_sfnt_off000122f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F3 2092 bytes
SHA-256: 13678a14b930e6d42e11b2ac41b13981c2c7f5938cc30cfb194ad51886f1f1dd
font_03_sfnt_off00012c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C98 11820 bytes
SHA-256: 254ac5ad1741d37c482db23ed49242dcd5ab651a7be04d28f1015dbcf608404d