Malicious PDF — malware analysis report

Static analysis result for SHA-256 6740e7cb0cdc5a8a…

MALICIOUS

PDF

76.1 KB Created: 2021-03-25 13:19:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 316a715910eefe388037482a0e362e76 SHA-1: 9057890d4377f6f456002131ef0baebdee353830 SHA-256: 6740e7cb0cdc5a8a4364373c46d44fd814958c9817f6a825479f8d9bc0519b42
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9999

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://jumiwimov.ru/strik?utm_term=what+is+the+purpose+of+the+decameron PDF link annotation
    • https://nadarikiwuxat.weebly.com/uploads/1/3/2/7/132712530/lakudi.pdfIn PDF document text
    • https://pesaladijij.weebly.com/uploads/1/3/1/3/131382382/f7ea55f2959.pdfIn PDF document text
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/judepi_xakutigi_jubimuvekide_legutefo.pdfIn PDF document text
    • https://vumiluvitut.weebly.com/uploads/1/3/2/6/132696113/5c01667550a4.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/3116676a-e2f6-4e87-89cb-fb2919577f27/nijid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f4ccbac-c1d6-4bba-ac7f-7946c2f28363/how_to_install_filter_in_drinkwell_platinum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce939b55-4ab9-4f71-bc37-0ecbaa9933d1/lozunufererazeladasodepu.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_56ecec75af0e4b87b1661b313499cf84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d8c82c-4a98-44aa-a2bd-9fdeeb6b7595/how_to_train_to_run_your_first_marathon.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/93079879255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc273fae-aec3-4916-a25d-2b38cc3dbcef/craftsman_circular_saw_repair_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3efef74-b1cf-460d-a5c8-554b4511accc/63516501105.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_090dde77d1674d91a8a40c16eaef2cee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/dangling_modifiers_quiz_with_answers.pdfIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_f8241894b3154ec1ba929f028e27453e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59075e50-0569-46f2-9958-f23566dd7055/64575515251.pdfIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_8c2677566db64be48598e448f5c7147f.pdf?index=trueIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_4425f6702c454e4483973ac65b399647.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 5376 bytes
SHA-256: d1c6a49e9ef061bb6d617c12c3d804ee581d1ebd6a3710218153292f8931fa4c
font_01_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 10452 bytes
SHA-256: 3dfc6a6efa839ce52ba861a87c9b3c01ce9c4ac5592acd436504de5cc5cfed9f

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