Malicious PDF — malware analysis report

Static analysis result for SHA-256 efff02a0671887c3…

MALICIOUS

PDF

87.0 KB Created: 2021-03-20 18:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2f2cac2d2b37c7cb12e4c1aee07423ce SHA-1: 86fabb86bf8f7b9e38299114d31340b5b98aa04d SHA-256: efff02a0671887c3cadda8a5ec443e9aa91307d79a5013eb57b5202779e574f5
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 0.9992

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://nipisod.ru/award?keyword=1050+commandments+in+the+new+testament+pdf PDF link annotation
    • https://cdn.sqhk.co/pixorikibam/9FAKibU/fejupe.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/iggfNy9/chocolate_truffle_recipe_easy_to_make.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/bgfhjgc/tattoo_sleeve_maker_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zukuxenopo/cBtageh/commuter_bike_clipless_pedals.pdfIn PDF document text
    • http://alania365.ru/alchemy_1000_combinations_listxez65.pdfIn PDF document text
    • https://boduburul.weebly.com/uploads/1/3/4/6/134654649/vajaxizodeza_mumivelirebifi_nuwevaxo.pdfIn PDF document text
    • http://usacreditscore.info/how_to_use_prestige_pressure_cooker_clip_onoz7wk.pdfIn PDF document text
    • http://zoomita.space/what_are_the_main_stock_exchangesvmrij.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/gfTaKgg/silvercloud_health_pricing.pdfIn PDF document text
    • http://abreudesigns.com/79126800662hovml.pdfIn PDF document text
    • https://cdn.sqhk.co/pobefozo/iaLgjjj/will_and_might_exercises_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/xurakipigub/jiidKgg/tentative_answer_key_meaning.pdfIn PDF document text
    • https://xorewodanuvidiw.weebly.com/uploads/1/3/1/3/131381095/1b7b5d.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/fOwEtif/46114318925.pdfIn PDF document text
    • http://smotrikino.fun/nordyne_gas_furnace_parts3mggm.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/i0qGmjj/18290192753.pdfIn PDF document text
    • https://tiselewo.weebly.com/uploads/1/3/1/6/131606631/8030921.pdfIn PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/sokisozawos_gapeweb_lajedosimodupa_wurovefosigumig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_d477fd20d6014b9d8f1a8f0eb7a8e185.pdf?index=trueIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_73982c4b39eb480ba22f6c65452b6efc.pdf?index=trueIn PDF document text
    • https://8be317c1-93d6-4444-9a1c-030c84ae583f.filesusr.com/ugd/709942_9b872c57d4b643f69a434f8d04d0ff51.pdf?index=trueIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_cb12a4694fba404caa1fd75fbd325873.pdf?index=trueIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_b243309063a24473b7abab4908af659c.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_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 5580 bytes
SHA-256: 50c4f40c35734f2253f5e54146e69cb0bd34ca17fac715bf6be187c9e88357c9
font_01_sfnt_off00012654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12654 11568 bytes
SHA-256: 51317064ec9ad8fffdef1de1632a9d5bd8a2c27c35e7202a0c60794b1acd94d0