Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b89359d80ea36db…

MALICIOUS

PDF

79.8 KB Created: 2021-05-16 13:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f4376a854bda6939637a3dfdbd194ee7 SHA-1: 2046a9ec2a2a4ccf148593f00aa33d1a0b33ab74 SHA-256: 3b89359d80ea36db4c240d33c4656981f3daa0cbd467f72ae881b5624f111af1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs extracted is https://mezovuduw.ru/strik?utm_term=hampton+bay+ceiling+fan+flush+mount+kit, which is likely used to redirect users to further malicious content or phishing pages. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/strik?utm_term=hampton+bay+ceiling+fan+flush+mount+kit PDF link annotation
    • https://cdn.sqhk.co/dojopaxitovi/jnheAxw/brawl_stars_wallpaper_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/aqihjih/18374456308.pdfIn PDF document text
    • http://wulurag.mygamesonline.org/tifilidegenuxagup.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.pdfIn PDF document text
    • http://vazagitomis.mypressonline.com/68438526101.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/dhijegi/highway_to_hell_chords.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/kenmore_ultra_stitch_12_model_15612.pdfIn PDF document text
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_c6d162cb1eb34e5782d0a46d124ddc36.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_f508c5cfba37424c804e599af1abb221.pdf?index=trueIn PDF document text
    • http://tuxabatadifu.onlinewebshop.net/vidurezebafewamube.pdfIn PDF document text
    • https://5b0ea1c3-b874-41d5-a3cc-49595beb80a6.filesusr.com/ugd/0c63be_05af32fbc9d749a6855b65c3a7d20e78.pdf?index=trueIn PDF document text
    • https://d7504aae-3d37-493f-8789-a5629a6fcc30.filesusr.com/ugd/7ca9f5_1bfcf5ac5d7449198eeb64ce465c4085.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_ba629145c46149d7968d7ababeba6b6c.pdf?index=trueIn PDF document text
    • http://nizofikunatafu.atwebpages.com/xupurefinegib.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_5977f2b113504a05a2b9647abbc6c3a9.pdf?index=trueIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_3c4128d6719941c2b0919b004c0f38e3.pdf?index=trueIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_32645541f8454cbcb4fb4d96e357c381.pdf?index=trueIn PDF document text
    • https://bed2d873-735b-46bb-a8a3-264d0455df4e.filesusr.com/ugd/03ede2_916dfcee4515472398110f1b572abb8c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/figugipopar/52980832674.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/infinitive_quiz_with_answers.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_5a80583369224a4990edc4a6198f49ae.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_bd160b99945d4033aa8ee17e6daf9b65.pdf?index=trueIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_74b79e0f2c254d3497ff4209a51eff56.pdf?index=trueIn PDF document text
    • https://78636f1b-f2d6-4e4a-b4e1-07eac4c165d1.filesusr.com/ugd/434c97_ca64efc3a73d4d818be54ee0de915c2c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/tubidalapuxi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 5600 bytes
SHA-256: 0cb97f37624eb77574cb74be152262448426819fc8f00602da0e0e4f7c126404
font_01_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 11052 bytes
SHA-256: cb7f92f8dbb458c6e1ede82a42b4f72dc701266a20dec7fb15e6a6a79ff95c2c

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