Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f402d24d9f1b2b…

MALICIOUS

PDF

102.1 KB Created: 2021-05-29 06:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a652f29cbfc5c4c1aff380daa6a90feb SHA-1: 58cba6bdd70cd41300c8eea1e1a414ef648524a0 SHA-256: b3f402d24d9f1b2b3815f42892452ba13cc4d0a3356f48bdb35d0e3190cf35bb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9998

Heuristics 5

  • 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://gimoguvi.ru/strik?utm_term=does+lifeinvader+have+a+rival PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376878/normal_600e64fd07e13.pdfIn PDF document text
    • https://bupudotededifo.weebly.com/uploads/1/3/5/3/135323991/8074048.pdfIn PDF document text
    • https://meverofukibax.weebly.com/uploads/1/3/4/6/134620555/fiwapef-tepixija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_604492643eff6.pdfIn PDF document text
    • https://vejuxafesopekub.weebly.com/uploads/1/3/6/0/136010302/3124866.pdfIn PDF document text
    • https://dovidememalow.weebly.com/uploads/1/3/4/6/134601329/dewimozazukaz.pdfIn PDF document text
    • https://mapunexi.weebly.com/uploads/1/3/3/9/133999872/ef95b.pdfIn PDF document text
    • https://bomirilipaxotez.weebly.com/uploads/1/3/4/0/134096722/4162350.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495707/normal_60016ffa2ce61.pdfIn PDF document text
    • https://dinamulu.weebly.com/uploads/1/3/1/6/131637284/2f3011c5b85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d3d78bd-9e75-4f28-9a1b-664caeabf03d/que_es_el_inicio_cuento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b24bbba-0e16-4bd7-b0a5-9fd546d84e87/vadovuforet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c92c160-2169-4da9-8999-af55e47bda0d/77493930973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9dcc8d6-6ff3-41a3-bad6-6f1cd27e5247/the_chimp_paradox_audiobook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d17e71-3528-4907-a160-a5f9a8c72925/moto_x_2nd_gen_green_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28417715-d804-4ee3-b9e5-bcc5ac9c038c/37786654589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83b9964-c998-44ac-9068-a22079023212/hp_psc_1315xi_check_print_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e08faf-5cf7-44a7-b640-7c8da731fc23/16843914707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7086eb7-2398-4954-8750-f6c8299c30a8/tecumseh_carburetor_parts_nz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA2 5056 bytes
SHA-256: 9ccdbf66ba87a06557a4bf4c5e80ef704c8d3cae3954184df91b01bfcd010683
font_01_sfnt_off00015fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD6 12404 bytes
SHA-256: 96ae4a65acc88a44d2a1a0da811f43a4e03d8571637d0487a72d641954b0af45

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