Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4bade3709616d8…

MALICIOUS

PDF

76.0 KB Created: 2021-03-08 11:24:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5483d77dc71c856b9a146d637cef03b3 SHA-1: 511d66d46951ed73ea154206f992a89b2fb00a86 SHA-256: ec4bade3709616d8dca5717785fb8b303c0157ff19e3e94684d0111e463cca96
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm used for SEO poisoning or phishing. One prominent URL, 'https://soxebez.ru/wix?keyword=polaris+sportsman+570+repair+manual', appears to be a lure for users searching for specific repair information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/wix?keyword=polaris+sportsman+570+repair+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489028/normal_60247191ce51e.pdfIn PDF document text
    • http://lifegirls.site/25711556495vo2om.pdfIn PDF document text
    • http://ellmax-site.xyz/78062290324w43z8.pdfIn PDF document text
    • http://vinnipoh.fun/screen_mirroring_android_to_car_stereonbisl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_60228536638f2.pdfIn PDF document text
    • http://olivamebel.com/cml_math_questions_grades_4-_6dij3u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_ee142dadc2a049eab2ee46776accd475.pdf?index=trueIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_8104d29a82c146b6b6f426f269fe771a.pdf?index=trueIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_57814d1eb33240a9bea1f928653e0067.pdf?index=trueIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_d5ecb7fcc8ef4a51acb66c0d302c1605.pdf?index=trueIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_36be82c990f04390a81f7a12b9b40d63.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_ee3b6d51b46d44048c2c9337c07a514c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b72f0d-73be-40e4-9fa6-1c751b7e0186/how_to_use_kenmore_warm_and_ready_drawer.pdfIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_13b34cb8a5914ae9a48c26251d462e86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ef4da5-7e12-4da6-9fb8-15c16de939fb/14584561305.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_a7bc6a6f56444662a2c432461152499f.pdf?index=trueIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_8b421738dd3841c98d6a7c6fb130c4cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74514c6-d78c-42d8-990b-81df739432e1/84838798847.pdfIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_a0479e35411046538fa9a0008cfef065.pdf?index=trueIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_6fa1090c3b4d40928a59c4a812b1dd55.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_4829a34a37aa42ba9c00c83714fcb0f8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 5196 bytes
SHA-256: 898bccec4a8ceeda1843b81b81eaa53e22d8876c5926829702a9296379631f67
font_01_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 10612 bytes
SHA-256: 8335d7441a95bc20a885e19a6191fabed3d2bf1de81afc4178a8719ed8855fcd
font_02_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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